CN203691043U - Alternating current shutdown circuit in instantaneous power failure prevention system - Google Patents
Alternating current shutdown circuit in instantaneous power failure prevention system Download PDFInfo
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- CN203691043U CN203691043U CN201320760839.6U CN201320760839U CN203691043U CN 203691043 U CN203691043 U CN 203691043U CN 201320760839 U CN201320760839 U CN 201320760839U CN 203691043 U CN203691043 U CN 203691043U
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- supply suspension
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Abstract
The utility model relates to an alternating current shutdown circuit in an instantaneous power failure prevention system. The circuit comprises a fluid-supply suspension relay, a bridge rectifier circuit, a first resistor, a first capacitor, a transistor, and a transistor drive circuit. A normally closed contact of the fluid-supply suspension relay is connected in series between an AC power supply and a contactor coil, and the normally closed contact is connected in parallel with a group of opposite output pins of the bridge rectifier circuit, and the other group of opposite input pins of the bridge rectifier circuit are connected in parallel between the source electrode and the drain electrode of the transistor, and the other group of opposite input pins are connected in parallel with the first resistor and the first capacitor. The grid electrode of the transistor is connected with a control unit through the transistor drive circuit. The fluid-supply suspension relay is connected with the control unit. When the contactor coil needs switching over to a DC power supply system, the control unit firstly makes the transistor connected, alternating current respectively flows through contacts of the transistor and the fluid-supply suspension relay. Then, the fluid-supply suspension relay obtains electricity, and the normally closed contact thereof is disconnected, and current is all transferred to the transistor. The fluid-supply suspension relay would not be disconnected with current in a segmentation process, so current interruption would not occur.
Description
Technical field
The alternating current that the utility model relates in a kind of voltage shock avoiding system cuts off circuit.
Background technology
In voltage shock avoiding system, need to be by alternating voltage power switching to DC-voltage supply, at present, as shown in Figure 1, to adopt transfer relay J0 directly to switch, particularly, first utilize the measuring circuit of Current Transmit and voltage transformer VT composition to measure the voltage U ac in AC system and electric current I ac, after AC system generation voltage falls, control unit ARM detects that voltage falls (being the voltage U ac that measures of measuring circuit and the variation of electric current I ac), transfer relay J0 is obtained electric, two normally-closed contact J0-1 and the J0-2 of transfer relay J0 are switched in direct current system, contactor coil KM is kept.In DC-voltage supply system, introduce 220V alternating voltage from AC power, utilize AC/DC that AC voltage conversion is become to direct voltage, realize step-down by a heavy-duty diode D, voltage after reduction is converted to the driving voltage that is applicable to described control unit ARM by voltage changer LDO, be described control unit ARM power supply; Simultaneously, voltage after reduction accesses the two ends of a capacitor C, the voltage VE at capacitor C two ends reaches after predetermined value, illustrate that capacitor C charging is complete, can be contactor coil KM power supply by the direct voltage through DC/DC voltage transformation, switching to DC-voltage supply system be that contactor coil KM carries out direct current supply.
In aforesaid way, because two normally-closed contact J0-1 and the J0-2 of transfer relay J0 in handoff procedure must can cut off electric current, there is the problem of relay contact arcing, affected by load current size, excessive relay current interruption failure, the sticky connection of relay contact of easily causing of electric current.The current interruption capacity of mini power relay of controlling due to control unit ARM is again generally all very little, therefore having another mode is by current zero-crossing point, relay to be disconnected, and in this mode, due to large (the ms extreme difference) of triggered time error of mini power relay, cannot accomplish that electric current is to cut off circuit at 1 o'clock completely, in principle, cannot solve contact arc discharge problem at all, finally cause relay often to damage, need frequently changing device more, and then cause larger economic loss, reduce production efficiency.
Utility model content
The utility model provides the alternating current in a kind of voltage shock avoiding system to cut off circuit, to solve the problem of electric power system handoff procedure repeat circuit contact arc discharge in existing voltage shock avoiding system.
For solving the problems of the technologies described above, the utility model provides the alternating current in voltage shock avoiding system to cut off circuit, comprise fluid-supply suspension, bridge rectifier, the first resistance, the first electric capacity, transistor and transistor driver circuit, the normally-closed contact of described fluid-supply suspension is series between AC power and contactor coil, and the output pin parallel connection relative with a group of described bridge rectifier, another of described bridge rectifier organized relative input pin and is parallel between described transistorized source electrode and drain electrode, and with described the first resistance and the first Capacitance parallel connection, described transistorized grid is connected with control unit by described transistor driver circuit, described fluid-supply suspension is also connected with described control unit.
Preferably, described control unit is connected to an input of the first optocoupler through the second resistance, another input of described the first optocoupler is connected to 5V DC power supply, two outputs of described the first optocoupler, an output is connected to earth terminal, and another output is connected to 24V DC power supply through described fluid-supply suspension.
Preferably, the two ends of described fluid-supply suspension and the first diodes in parallel, the 3rd resistance is also in parallel with described fluid-supply suspension with after the second capacitances in series.
Preferably, described transistor driver circuit comprises push-pull circuit, the 6th resistance, voltage-stabiliser tube, the 3rd electric capacity, the second diode and the 7th resistance, described control unit is connected to the input of described push-pull circuit through the second optocoupler, the output of described push-pull circuit is connected to the 6th resistance and the voltage-stabiliser tube being connected in series, one article of branch road of its output is connected to described transistorized grid through the 8th resistance, another article branch road is connected to earth terminal through described the 7th resistance, described the second diode is in parallel with described the 6th resistance, and described the 3rd electric capacity is in parallel with described voltage-stabiliser tube.
Preferably, described the first electric capacity is made up of two electric capacity of mutually connecting.
Alternating current in the voltage shock avoiding system that the utility model provides cuts off circuit, comprise fluid-supply suspension, bridge rectifier, the first resistance, the first electric capacity, transistor and transistor driver circuit, the normally-closed contact of fluid-supply suspension is series between AC power and contactor coil, and the output pin parallel connection relative with a group of bridge rectifier, another of bridge rectifier organized relative input pin and is parallel between transistorized source electrode and drain electrode, and with the first resistance and the first Capacitance parallel connection, transistorized grid is connected with control unit by transistor driver circuit, fluid-supply suspension is also connected with control unit.In the time that contactor coil is switched to DC power-supply system by needs, control unit Schilling transistor turns, alternating current flows through from the contact of transistor and fluid-supply suspension respectively, then, fluid-supply suspension is obtained electric, its normally-closed contact disconnects, electric current is all transferred in transistor, fluid-supply suspension does not pull open electric current in fragmentation procedure, can current interruption, after the normally-closed contact of fluid-supply suspension disconnects completely, control unit triggers transistor driver circuit, make transistor cut-off, due to the first larger resistance parallel connection of transistor AND gate resistance, and transistorized off-resistances is far longer than the first resistance, therefore, be equivalent to the first resistance to connect in the loop at contactor coil and transfer relay place, now, electric current in this loop has dropped to below 10mA, the current interruption ability of transfer relay is far longer than 10mA, therefore, control unit make transfer relay obtain electric after, two normally-closed contacts of transfer relay can be switched in direct current system smoothly, adopting DC power-supply system is contactor coil power supply.
Accompanying drawing explanation
Fig. 1 is the switching mode circuit theory diagrams in existing voltage shock avoiding system;
Fig. 2 is the schematic diagram that the alternating current in the voltage shock avoiding system of the utility model one embodiment cuts off circuit;
Fig. 3 is the circuit interconnect pattern that the alternating current in the voltage shock avoiding system of the utility model one embodiment cuts off circuit interrupt flow relay;
Fig. 4 is the circuit diagram that the alternating current in the voltage shock avoiding system of the utility model one embodiment cuts off circuit.
Embodiment
For the technical scheme of the more detailed above-mentioned utility model of statement, below list specific embodiment and carry out Proof Technology effect; It is emphasized that these embodiment are not limited to limit scope of the present utility model for the utility model is described.
Please refer to Fig. 2 to Fig. 4, alternating current in the voltage shock avoiding system that the utility model provides cuts off circuit, comprise fluid-supply suspension J1, described in bridge rectifier BR(, bridge rectifier BR is by four diode D5, D6, D7 and D8 connect to form), the first resistance R 1, the first capacitor C 1, transistor IGBT and transistor driver circuit, the normally-closed contact J1-1 of described fluid-supply suspension J1 is series between AC power (220V) and contactor coil KM, and the output pin parallel connection relative with a group of described bridge rectifier BR, another of described bridge rectifier BR organized between the source electrode (the S utmost point) and drain electrode (the D utmost point) that relative input pin is parallel to described transistor IGBT, and in parallel with described the first resistance R 1 and the first capacitor C 1, the grid (the G utmost point) of described transistor IGBT is connected with control unit ARM by described transistor driver circuit, described fluid-supply suspension J1 is also connected with described control unit ARM.The utility model adopts the normally-closed contact J1-1 parallel connection of transistor IGBT and fluid-supply suspension J1, before relay triggers disconnection, first conducting IGBT, resistance very little (bold and unconstrained Europe level) after IGBT conducting, in the time triggering fluid-supply suspension J1 disconnection, electric current is transferred to transistor IGBT from contact, in whole fluid-supply suspension J1 disconnection process, relay contact is without arcing process, thereby needs the problem of current interruption fundamentally having solved relay open circuit.And at AC system power switching in direct current system power supply process, switch speed is accelerated, element is more reliable and stable, avoid low power relay current interruption ability and the phenomenon of frequent breakage, improve the reliability of product, avoid voltage shock avoiding system owing to switching the unreliable economic loss causing, often avoid more changing device, improved production efficiency.And with respect to current over-zero changing method, the switching instant of circuit can be arbitrarily, without waiting for the current over-zero moment, thus faster on switch speed.
Please emphasis with reference to figure 2, it is as follows that the alternating current in the voltage shock avoiding system that the utility model provides cuts off circuit specific works process:
After anti-shake electric system powers on, the coil of fluid-supply suspension J1 and transfer relay J2 is and does not obtain electricity condition, therefore the normally-closed contact J1-1 of fluid-supply suspension J1 and normally-closed contact J2-1, the J2-2 of transfer relay J2 are all closed, the loop that alternating current directly forms from normally-closed contact J1-1, J2-1 and J2-2, be applied to the two ends of contactor coil KM, contactor inhale and;
In the time that electric power system is switched to direct current supply by needs, control unit ARM is first by described transistor driver circuit driving transistors IGBT conducting, and conducting resistance after transistor IGBT conducting is very little, now electric current flows through from the normally-closed contact J1-1 of transistor IGBT and fluid-supply suspension J1 respectively;
Then, the coil of control unit ARM triggering fluid-supply suspension J1 obtains electric, and the normally-closed contact J1-1 of fluid-supply suspension J1 is disconnected, in the process disconnecting, electric current, gradually to flowing through from transistor IGBT completely, through delay confirmation, disconnects with the normally-closed contact J1-1 that guarantees fluid-supply suspension J1 completely.Because electric current in the normally-closed contact J1-1 disconnection process of fluid-supply suspension J1 is all transferred to from transistor IGBT and flow through, fluid-supply suspension J1 does not pull open electric current in breaking course, therefore can current interruption;
After the normally-closed contact J1-1 of fluid-supply suspension J1 disconnects, control unit ARM triggers transistor driver circuit, make transistor IGBT cut-off, due to transistor IGBT and the first larger resistance R 1 parallel connection of resistance, and the off-resistances of transistor IGBT is far longer than the first resistance R 1, therefore be equivalent to the first resistance R 1 to seal in the loop at contactor coil KM and transfer relay J2 place, electric current now has been reduced to below 10mA, the current interruption ability of transfer relay J2 is far longer than 10mA, therefore control unit ARM can directly start transfer relay J2, switching dc voltage is contactor coil KM power supply.
Preferably, please emphasis with reference to figure 3, described control unit ARM is connected to an input of the first optocoupler U1 through the second resistance R 2, another input of described the first optocoupler U1 is connected to 5V DC power supply, two outputs of described the first optocoupler U1, an output is connected to earth terminal, and another output is connected to 24V DC power supply through described fluid-supply suspension J1.Particularly, 5V DC power supply is the driving power of the first optocoupler U1, when control unit ARM exports corresponding signal, carries out signal isolation through the first optocoupler U1, finally makes fluid-supply suspension J1 obtain electric.Preferably, the two ends of described fluid-supply suspension J1 are in parallel with the first diode V1, the 3rd resistance R 3 is also in parallel with described fluid-supply suspension J1 after connecting with the second capacitor C 2, in order to absorb the inverse electromotive force producing in fluid-supply suspension J1 gain and loss electric process, improves the anti-interference of circuit.
Preferably, please emphasis with reference to figure 4, described transistor driver circuit comprises push-pull circuit, the 6th resistance R 6, voltage-stabiliser tube D3, the 3rd capacitor C 3, the second diode D2 and the 7th resistance R 7, described control unit ARM is connected to the input of described push-pull circuit through the second optocoupler U2, the output of described push-pull circuit is connected to the 6th resistance R 6 and the voltage-stabiliser tube D3 that are connected in series, one article of branch road of its output is connected to the grid of described transistor IGBT through the 8th resistance R 8, another article branch road is connected to earth terminal through described the 7th resistance R 7, the input of described push-pull circuit is connected to earth terminal through the 5th resistance R 5, described the second diode D2 is in parallel with described the 6th resistance R 6, described the 3rd capacitor C 3 is in parallel with described voltage-stabiliser tube D3.Wherein, the 6th resistance R 6 and the voltage-stabiliser tube D3 that are connected in series, the cathode terminal and the 6th resistance R 6 that are specially voltage-stabiliser tube D3 are connected in series; Wherein, the second diode D2 is in parallel with described the 6th resistance R 6, and the anode tap that is specially the second diode D2 is connected to the common intersection of the 6th resistance R 6 and voltage-stabiliser tube D3.Particularly, described push-pull circuit is formed by connecting by bipolarity different triode Q1 and Q2, the state in a conducting, a cut-off all the time, and conduction loss is little, and efficiency is high.
Preferably, please continue to refer to Fig. 4, described the first capacitor C 1 is made up of two electric capacity E1 and E2 that mutually connect, to increase its resistance to pressure.Wherein, electric capacity E1 and E2 are polarity free capacitor or are electrochemical capacitor.
In sum, alternating current in the voltage shock avoiding system that the utility model provides cuts off circuit, comprise fluid-supply suspension J1, bridge rectifier BR, the first resistance R 1, the first capacitor C 1, transistor IGBT and transistor driver circuit, the normally-closed contact J1-1 of fluid-supply suspension J1 is series between AC power and contactor coil KM, and the output pin parallel connection relative with a group of bridge rectifier BR, another of bridge rectifier BR organize relative input pin be parallel to transistor IGBT source electrode and drain electrode between, and in parallel with the first resistance R 1 and the first capacitor C 1, the grid of transistor IGBT is connected with control unit ARM by transistor driver circuit, fluid-supply suspension J1 is also connected with control unit.
In the time that contactor coil KM is switched to DC power-supply system by needs, the conducting of control unit ARM Schilling transistor IGBT, alternating current flows through from the normally-closed contact J1-1 of transistor IGBT and fluid-supply suspension J1 respectively, then, fluid-supply suspension J1 is obtained electric, its normally-closed contact disconnects, electric current is all transferred in transistor IGBT, fluid-supply suspension J1 does not pull open electric current in fragmentation procedure, can current interruption, after the normally-closed contact J1-1 of fluid-supply suspension J1 disconnects completely, control unit ARM triggers transistor driver circuit, make transistor IGBT cut-off, because the first resistance R 1 that transistor IGBT is larger with resistance is in parallel, and the off-resistances of transistor IGBT is far longer than the first resistance R 1, therefore, be equivalent to the first resistance R 1 to connect in the loop at contactor coil KM and transfer relay J2 place, now, electric current in this loop has dropped to below 10mA, the current interruption ability of transfer relay J2 is far longer than 10mA, therefore, control unit ARM make transfer relay J2 obtain electric after, two normally-closed contact J2-1 of transfer relay J2, J2-2 can be switched in direct current system smoothly, adopting DC power-supply system is contactor coil KM power supply.
Obviously, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to including these changes and modification.
Claims (5)
1. the alternating current in a voltage shock avoiding system cuts off circuit, it is characterized in that, comprise fluid-supply suspension, bridge rectifier, the first resistance, the first electric capacity, transistor and transistor driver circuit, the normally-closed contact of described fluid-supply suspension is series between AC power and contactor coil, and the output pin parallel connection relative with a group of described bridge rectifier, another of described bridge rectifier organized relative input pin and is parallel between described transistorized source electrode and drain electrode, and with described the first resistance and the first Capacitance parallel connection, described transistorized grid is connected with control unit by described transistor driver circuit, described fluid-supply suspension is also connected with described control unit.
2. the alternating current in voltage shock avoiding system as claimed in claim 1 cuts off circuit, it is characterized in that, described control unit is connected to an input of the first optocoupler through the second resistance, another input of described the first optocoupler is connected to 5V DC power supply, two outputs of described the first optocoupler, an output is connected to earth terminal, and another output is connected to 24V DC power supply through described fluid-supply suspension.
3. the alternating current in voltage shock avoiding system as claimed in claim 2 cuts off circuit, it is characterized in that, and the two ends of described fluid-supply suspension and the first diodes in parallel, the 3rd resistance is also in parallel with described fluid-supply suspension with after the second capacitances in series.
4. the alternating current in voltage shock avoiding system as claimed in claim 1 cuts off circuit, it is characterized in that, described transistor driver circuit comprises push-pull circuit, the 6th resistance, voltage-stabiliser tube, the 3rd electric capacity, the second diode and the 7th resistance, described control unit is connected to the input of described push-pull circuit through the second optocoupler, the output of described push-pull circuit is connected to the 6th resistance and the voltage-stabiliser tube being connected in series, one article of branch road of its output is connected to described transistorized grid through the 8th resistance, another article branch road is connected to earth terminal through described the 7th resistance, described the second diode is in parallel with described the 6th resistance, described the 3rd electric capacity is in parallel with described voltage-stabiliser tube.
5. the alternating current in voltage shock avoiding system as claimed in claim 1 cuts off circuit, it is characterized in that, described the first electric capacity is made up of two electric capacity of mutually connecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320760839.6U CN203691043U (en) | 2013-11-26 | 2013-11-26 | Alternating current shutdown circuit in instantaneous power failure prevention system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320760839.6U CN203691043U (en) | 2013-11-26 | 2013-11-26 | Alternating current shutdown circuit in instantaneous power failure prevention system |
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| Publication Number | Publication Date |
|---|---|
| CN203691043U true CN203691043U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320760839.6U Expired - Fee Related CN203691043U (en) | 2013-11-26 | 2013-11-26 | Alternating current shutdown circuit in instantaneous power failure prevention system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467171A (en) * | 2015-01-07 | 2015-03-25 | 上海瑞甸电子科技有限公司 | Interference electricity prevention device |
| CN105305606A (en) * | 2015-11-25 | 2016-02-03 | 江永县元杰科技有限公司 | Self-powered monitoring device in power outage |
| CN111910391A (en) * | 2019-05-10 | 2020-11-10 | 黄军贤 | Self-cleaning method of full-automatic washing machine |
-
2013
- 2013-11-26 CN CN201320760839.6U patent/CN203691043U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467171A (en) * | 2015-01-07 | 2015-03-25 | 上海瑞甸电子科技有限公司 | Interference electricity prevention device |
| CN105305606A (en) * | 2015-11-25 | 2016-02-03 | 江永县元杰科技有限公司 | Self-powered monitoring device in power outage |
| CN111910391A (en) * | 2019-05-10 | 2020-11-10 | 黄军贤 | Self-cleaning method of full-automatic washing machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20171126 |
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| CF01 | Termination of patent right due to non-payment of annual fee |