CN203086112U - Comprehensive multi-loop motor protector for coal mine - Google Patents
Comprehensive multi-loop motor protector for coal mine Download PDFInfo
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- CN203086112U CN203086112U CN 201220733731 CN201220733731U CN203086112U CN 203086112 U CN203086112 U CN 203086112U CN 201220733731 CN201220733731 CN 201220733731 CN 201220733731 U CN201220733731 U CN 201220733731U CN 203086112 U CN203086112 U CN 203086112U
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Abstract
A comprehensive multi-loop motor protector for coal mine comprises a voltage conversion device, overload setting circuits, a leakage setting circuit, an overheat setting circuit, a thermal short circuit setting circuit, a logic processing single chip microcomputer, a drive circuit and a fault information processing single chip microcomputer. Signal output lines of the overload setting circuits, a signal output line of the leakage setting circuit, a signal output line of the overheat setting circuit and a signal output line of the thermal short circuit setting circuit are connected with corresponding input pins of the logic processing single chip microcomputer respectively; circuit grounding points of the overload setting circuits, the leakage setting circuit, the overheat setting circuit, the thermal short circuit setting circuit and the logic processing single chip microcomputer are arranged in a common ground mode; an output pin of the logic processing single chip microcomputer is connected with a corresponding input pin of the drive circuit; one group of output pins of the drive circuit is connected with corresponding input pins of the fault information processing single chip microcomputer; and the other group of output pins of the drive circuit is connected with control signal input pins of corresponding relays. The comprehensive multi-loop motor protector for coal mine can monitor and control the running state and the fault state of a motor in a centralized mode.
Description
Technical field
The utility model relates to a kind of circuit protection device, particularly relates to a kind of motor circuit protective device that is used for mining motor.Background technology
The motor that existing motor protecter mostly adopts thermal relay or Analogical Electronics protector to move for operating mode provides protection; but protector can not correctly reflect work condition environment; independent between the signal; the detailed process that can not generate heat in actual condition, dispel the heat motor is comprehensively judged; can not set up simulation model to fault in-situ; the discreteness of self in addition is interfered easily thereby can not protects motor effectively.
Existing motor protecter is discrete use, each other can not communication.Can't accomplish motoring and malfunction are concentrated supervision and control.
Existing motor protecter wiring is many, particularly all wants 3 lines with each loop of line of fault detector, and a plurality of signal circuit wiring hell to pays are made mistakes easily.
The utility model content
The purpose of this utility model provides a kind of colliery multiloop comprehensive protector of motor, and solving the virtual condition of motor when operating mode can't effectively feed back, and can not form the technical problem of effective control.
Colliery of the present utility model multiloop comprehensive protector of motor; comprise voltage conversion device; overload adjust circuit, electric leakage adjust circuit, overheated circuit and the short circuit of adjusting of heat adjusted, wherein: also comprise logical process single-chip microcomputer, drive circuit and fault message processing single chip
Described overload the adjust output line road of the output line road of circuit, the overheated circuit of adjusting, the output line road of the short circuit of adjusting of heat of output line road, the electric leakage of circuit of adjusting connects the corresponding input pin of logical process single-chip microcomputer respectively, and overload the adjust circuit ground point of circuit, the overheated circuit of adjusting, heat short adjust circuit and logical process single-chip microcomputer of circuit, electric leakage of adjusting is provided with altogether;
The output pin of logical process single-chip microcomputer connects the corresponding input pin of drive circuit, one group of output pin of drive circuit connects the corresponding input pin of fault message processing single chip, and another group output pin of drive circuit connects the control signal input pin of corresponding relay.
The described overload circuit overloads circuit of adjusting of adjusting comprises first operational amplifier, resistance R 2, resistance R 3, resistance R 4, variable resistor RT1, variable resistor RT2, capacitor C 8 and voltage stabilizing didoe DW2,
The in-phase input end that connects first operational amplifier behind the incoming line series resistance R2, the output series resistance R3 of first operational amplifier, resistance R 4 backs connect outlet line, ground connection behind voltage stabilizing didoe DW2 that the in-phase input end connection of first operational amplifier is in parallel and the variable resistor RT2, the negative pole of voltage stabilizing didoe DW2 connects the in-phase input end of first operational amplifier, ground connection behind the resistance R 3 series connection variable resistor RT1, ground connection behind the resistance R 4 series capacitance C8, the inverting input of first operational amplifier is connected the 15V operating voltage with output.
The described electric leakage circuit of adjusting comprises second operational amplifier, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, resistance R 43, resistance R 44, resistance R 45, variable resistor RT3, capacitor C 11, capacitor C 12, diode D1, diode D2, diode D3, diode D7 and voltage stabilizing didoe DW5
Connect the 15V operating voltage behind the in-phase input end series resistance R8 of second operational amplifier, be connected outlet line after the output series resistance R11 of second operational amplifier and the resistance R 12, series resistance R9 between the in-phase input end of the output of second operational amplifier and second operational amplifier, resistance R 10 and diode D3, diode D3 negative pole connects resistance R 10, the in-phase input end of second operational amplifier connects parallel resistor R44, resistance R 45 and capacitor C 12 back ground connection, ground connection behind the resistance R 11 series connection variable resistor RT3, ground connection behind the inverting input series resistance R43 of second operational amplifier and the diode D7, the negative pole of diode D7 connects resistance R 43, voltage stabilizing didoe DW5 is in parallel with diode D7, the negative pole of voltage stabilizing didoe DW5 connects resistance R 43, resistance R 6 is in parallel with diode D7 with the series circuit that capacitor C 11 is formed, be connected resistance R 5 between resistance R 6 and the resistance R 8, resistance R 7 one ends are connected on the series circuit of 11 of resistance R 6 and capacitor C, the other end is connected incoming line behind series diode D2 and the diode D1 successively, the negative pole of the cathode connecting diode D2 of diode D1, the positive pole of diode D2 connects resistance R 7.
The described overheated circuit of adjusting comprises the 3rd operational amplifier with the short circuit of adjusting of heat, four-operational amplifier IC4, diode D4, diode D5, diode D9, diode D10, capacitor C 17, capacitor C 13, capacitor C 18, capacitor C 14, variable resistor RT4, variable resistor RT5, resistance R 15, resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 23, resistance R 24, resistance R 25, resistance R 26, resistance R 27, resistance R 28, resistance R 29, resistance R 30
Connect the 15V operating voltage behind the in-phase input end series resistance R15 of the 3rd operational amplifier, the output of the 3rd operational amplifier is series resistance R19 successively, be connected outlet line behind resistance R 20 and the diode D10, the positive pole of diode D10 connects resistance R 20, the in-phase input end of the 3rd operational amplifier is connected output behind series resistance R16 and the diode D4 successively, the negative pole of diode D4 connects resistance R 16, the in-phase input end of the 3rd operational amplifier connects parallel resistor R21, resistance R 22 and capacitor C 17 back ground connection, the inverting input of the 3rd operational amplifier is connected incoming line after series resistance R18 and the resistance R 17 successively, the inverting input of the 3rd operational amplifier connects capacitor C 13 back ground connection, ground connection behind the resistance R 19 connection variable resistor RT4;
The in-phase input end series resistance R25 of four-operational amplifier, be connected incoming line after resistance R 23 and the resistance R 17, the output of four-operational amplifier is series resistance R29 successively, be connected outlet line behind resistance R 30 and the diode D9, the anodal resistance R 30 that connects of diode D9, the in-phase input end of four-operational amplifier is connected output behind series resistance R24 and the diode D5 successively, the negative pole of diode D5 connects resistance R 24, the in-phase input end of four-operational amplifier connects capacitor C 14 back ground connection, ground connection behind the resistance R 29 connection variable resistor RT5, connect the 15V operating voltage behind the inverting input series resistance R26 of four-operational amplifier, the inverting input of four-operational amplifier connects parallel resistor R27, resistance R 28 and capacitor C 18 back ground connection.
Concentrate with multiloop comprehensive protector of motor control circuit in colliery of the present utility model; can carry out comprehensive analysis processing to the motor working condition signal by the logical process single-chip microcomputer, be easy to accomplish motoring and malfunction are concentrated supervision and control.Utilize integrated circuit technique, circuit connection is shorter, and the fault point is few.By to the lasting comparison of motor working condition signal, judge not only the detailed process of can simulated machine in actual condition, generate heat, dispelling the heat, and all have significant improvement in links such as reliability anti-interference and that protect.
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
Description of drawings
Fig. 1 is the structural representation of the utility model colliery with the multiloop comprehensive protector of motor;
Fig. 2 for the utility model colliery with the adjust structural representation of circuit of overload in the multiloop comprehensive protector of motor;
Fig. 3 for the utility model colliery with the adjust structural representation of circuit of electric leakage in the multiloop comprehensive protector of motor;
Fig. 4 is the structural representation of the utility model colliery with overheated adjust circuit and the short circuit of adjusting of heat in the multiloop comprehensive protector of motor.
Embodiment
As shown in Figure 1, in the present embodiment, comprise overload adjust circuit 01, electric leakage adjust circuit 02, the overheated circuit 03 of adjusting, heat short adjust circuit 04, logical process single-chip microcomputer 05, drive circuit 06 and fault message processing single chip 07;
The overload circuit 01 of adjusting connects current sampler by incoming line, and the current strength variable signal with in the motor uniline of gathering exports logical process single-chip microcomputer 05 to;
The electric leakage circuit 02 of adjusting connects the earth leakage protective relay by incoming line, and the motor leakage current Strength Changes signal with gathering exports logical process single-chip microcomputer 05 to;
The overheated circuit 03 of adjusting connects thermal relay or thermistor by incoming line, and the operating temperature variable signal with the electromechanics device gathered exports logical process single-chip microcomputer 05 to;
The short circuit 04 of adjusting of heat connects thermal relay or thermistor by incoming line, and the motor short circuit current variable signal with gathering exports logical process single-chip microcomputer 05 to;
Logical process single-chip microcomputer 05, the reception in real time status signal that circuit transmits of respectively adjusting compares with electric current, the voltage setting value of the built-in corresponding circuit of adjusting, and forms the malfunction code signal with the motor operating state coupling, and exports drive circuit 06 to;
Fault message processing single chip 07 generates video data according to the malfunction coding, is sent to continuous fault detector and shows.
Logical process single-chip microcomputer 05 adopts PIC16C71 series monolithic chip, and drive circuit 06 adopts the ULN2004 family chip, and fault message processing single chip 07 adopts 8 general single-chip microcomputers.
Three overloads adjust output line road of the output line road of circuit 02, the overheated circuit 03 of adjusting, the output line road of the short circuit 04 of adjusting of heat of output line road, the electric leakage of circuit 01 of adjusting connects the corresponding input pin of logical process single-chip microcomputer 05 respectively, and overload the adjust circuit ground point of circuit 02, the overheated circuit 03 of adjusting, heat short adjust circuit 04 and logical process single-chip microcomputer 05 of circuit 01, electric leakage of adjusting is provided with altogether.
Five output pins of logical process single-chip microcomputer 05 connect five corresponding input pins of drive circuit 06 respectively, three output pins of drive circuit 06 connect three input pins of fault message processing single chip 07, and another output pin of drive circuit 06 connects the control signal input pin of relay 08.Drive circuit 06 can connect several corresponding relays 08 by one group of output pin and control.
Present embodiment also comprises a voltage conversion device, connects the 24V intrinsic safety operating voltage of input, exports 24V operating voltage, 15V operating voltage and 5V operating voltage respectively.
As shown in Figure 2, the overload circuit of adjusting comprises the first operational amplifier IC1, resistance R 2, resistance R 3, resistance R 4, variable resistor RT1, variable resistor RT2, capacitor C 8 and voltage stabilizing didoe DW2,
The in-phase input end that connects the first operational amplifier IC1 behind the incoming line series resistance R2, the output series resistance R3 of the first operational amplifier IC1, resistance R 4 backs connect outlet line, ground connection behind voltage stabilizing didoe DW2 that the in-phase input end connection of the first operational amplifier IC1 is in parallel and the variable resistor RT2, the negative pole of voltage stabilizing didoe DW2 connects the in-phase input end of the first operational amplifier IC1, ground connection behind the resistance R 3 series connection variable resistor RT1, ground connection behind the resistance R 4 series capacitance C8, the inverting input of the first operational amplifier IC1 is connected the 15V operating voltage with output;
As shown in Figure 3, the electric leakage circuit of adjusting comprises the second operational amplifier IC2, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, resistance R 43, resistance R 44, resistance R 45, variable resistor RT3, capacitor C 11, capacitor C 12, diode D1, diode D2, diode D3, diode D7 and voltage stabilizing didoe DW5
Connect the 15V operating voltage behind the in-phase input end series resistance R8 of the second operational amplifier IC2, be connected outlet line after the output series resistance R11 of the second operational amplifier IC2 and the resistance R 12, series resistance R9 between the in-phase input end of the output of the second operational amplifier IC2 and the second operational amplifier IC2, resistance R 10 and diode D3, diode D3 negative pole connects resistance R 10, the in-phase input end of the second operational amplifier IC2 connects parallel resistor R44, resistance R 45 and capacitor C 12 back ground connection, ground connection behind the resistance R 11 series connection variable resistor RT3, ground connection behind the inverting input series resistance R43 of the second operational amplifier IC2 and the diode D7, the negative pole of diode D7 connects resistance R 43, voltage stabilizing didoe DW5 is in parallel with diode D7, the negative pole of voltage stabilizing didoe DW5 connects resistance R 43, resistance R 6 is in parallel with diode D7 with the series circuit that capacitor C 11 is formed, be connected resistance R 5 between resistance R 6 and the resistance R 8, resistance R 7 one ends are connected on the series circuit of 11 of resistance R 6 and capacitor C, the other end is connected incoming line behind series diode D2 and the diode D1 successively, the negative pole of the cathode connecting diode D2 of diode D1, the positive pole of diode D2 connects resistance R 7;
As shown in Figure 4, the overheated circuit 03 of adjusting comprises the 3rd operational amplifier IC3 with the short circuit 04 of adjusting of heat, four-operational amplifier IC4, diode D4, diode D5, diode D9, diode D10, capacitor C 17, capacitor C 13, capacitor C 18, capacitor C 14, variable resistor RT4, variable resistor RT5, resistance R 15, resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 23, resistance R 24, resistance R 25, resistance R 26, resistance R 27, resistance R 28, resistance R 29, resistance R 30
In the overheated circuit 03 of adjusting, connect the 15V operating voltage behind the in-phase input end series resistance R15 of the 3rd operational amplifier IC3, the output of the 3rd operational amplifier IC3 is series resistance R19 successively, be connected outlet line behind resistance R 20 and the diode D10, the positive pole of diode D10 connects resistance R 20, the in-phase input end of the 3rd operational amplifier IC3 is connected output behind series resistance R16 and the diode D4 successively, the negative pole of diode D4 connects resistance R 16, the in-phase input end of the 3rd operational amplifier IC3 connects parallel resistor R21, resistance R 22 and capacitor C 17 back ground connection, the inverting input of the 3rd operational amplifier IC3 is connected incoming line after series resistance R18 and the resistance R 17 successively, the inverting input of the 3rd operational amplifier IC3 connects capacitor C 13 back ground connection, ground connection behind the resistance R 19 connection variable resistor RT4;
In the short circuit 04 of adjusting of heat, the in-phase input end series resistance R25 of four-operational amplifier IC4, be connected incoming line after resistance R 23 and the resistance R 17, the output of four-operational amplifier IC4 is series resistance R29 successively, be connected outlet line behind resistance R 30 and the diode D9, the anodal resistance R 30 that connects of diode D9, the in-phase input end of four-operational amplifier IC4 is connected output behind series resistance R24 and the diode D5 successively, the negative pole of diode D5 connects resistance R 24, the in-phase input end of four-operational amplifier IC4 connects capacitor C 14 back ground connection, ground connection behind the resistance R 29 connection variable resistor RT5, connect the 15V operating voltage behind the inverting input series resistance R26 of four-operational amplifier IC4, the inverting input of four-operational amplifier IC4 connects parallel resistor R27, resistance R 28 and capacitor C 18 back ground connection;
The operational amplifier of respectively adjusting in the circuit can adopt LM124 series amplifier chip.
In the practical application present embodiment can judge motor before start when concrete fault takes place the work condition state in each stage, make the operation of motor be under the effective monitoring all the time, in case fault takes place, can finish the action of threading off by the quick control relay, simultaneously the malfunction coding is sent to the fault message processing single chip and be used for showing.
Above-described embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that those of ordinary skills make the technical solution of the utility model all should fall in the definite protection range of the utility model claims.
Claims (4)
1. colliery multiloop comprehensive protector of motor; comprise voltage conversion device; overload adjust circuit (02), the overheated circuit of adjusting (03) and the heat of circuit (01), electric leakage of adjusting is lacked the circuit (04) of adjusting; it is characterized in that: also comprise logical process single-chip microcomputer (05), drive circuit (06) and fault message processing single chip (07)
Described overload the adjust output line road, the output line road of the short circuit (04) of adjusting of heat of output line road, the overheated circuit of adjusting (03) of circuit (02) of output line road, the electric leakage of circuit (01) of adjusting connects the corresponding input pin of logical process single-chip microcomputer (05) respectively, and overload the adjust circuit ground point of circuit (02), the overheated circuit of adjusting (03), heat short adjust circuit (04) and logical process single-chip microcomputer (05) of circuit (01), electric leakage of adjusting is provided with altogether;
The output pin of logical process single-chip microcomputer (05) connects the corresponding input pin of drive circuit (06), one group of output pin of drive circuit (06) connects the corresponding input pin of fault message processing single chip (07), and another group output pin of drive circuit (06) connects the control signal input pin of corresponding relay (08).
2. colliery according to claim 1 multiloop comprehensive protector of motor; it is characterized in that: the described overload circuit (01) of adjusting comprises first operational amplifier (IC1), resistance R 2, resistance R 3, resistance R 4, variable resistor RT1, variable resistor RT2, capacitor C 8 and voltage stabilizing didoe DW2
The in-phase input end that connects first operational amplifier (IC1) behind the incoming line series resistance R2, the output series resistance R3 of first operational amplifier (IC1), resistance R 4 backs connect outlet line, ground connection behind voltage stabilizing didoe DW2 that the in-phase input end connection of first operational amplifier (IC1) is in parallel and the variable resistor RT2, the negative pole of voltage stabilizing didoe DW2 connects the in-phase input end of first operational amplifier (IC1), ground connection behind the resistance R 3 series connection variable resistor RT1, ground connection behind the resistance R 4 series capacitance C8, the inverting input of first operational amplifier (IC1) is connected the 15V operating voltage with output.
3. colliery according to claim 1 multiloop comprehensive protector of motor; it is characterized in that: the described electric leakage circuit (02) of adjusting comprises second operational amplifier (IC2), resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, resistance R 43, resistance R 44, resistance R 45, variable resistor RT3, capacitor C 11, capacitor C 12, diode D1, diode D2, diode D3, diode D7 and voltage stabilizing didoe DW5
Connect the 15V operating voltage behind the in-phase input end series resistance R8 of second operational amplifier (IC2), be connected outlet line after the output series resistance R11 of second operational amplifier (IC2) and the resistance R 12, series resistance R9 between the in-phase input end of the output of second operational amplifier (IC2) and second operational amplifier (IC2), resistance R 10 and diode D3, diode D3 negative pole connects resistance R 10, the in-phase input end of second operational amplifier (IC2) connects parallel resistor R44, resistance R 45 and capacitor C 12 back ground connection, ground connection behind the resistance R 11 series connection variable resistor RT3, ground connection behind the inverting input series resistance R43 of second operational amplifier (IC2) and the diode D7, the negative pole of diode D7 connects resistance R 43, voltage stabilizing didoe DW5 is in parallel with diode D7, the negative pole of voltage stabilizing didoe DW5 connects resistance R 43, resistance R 6 is in parallel with diode D7 with the series circuit that capacitor C 11 is formed, be connected resistance R 5 between resistance R 6 and the resistance R 8, resistance R 7 one ends are connected on the series circuit of 11 of resistance R 6 and capacitor C, the other end is connected incoming line behind series diode D2 and the diode D1 successively, the negative pole of the cathode connecting diode D2 of diode D1, the positive pole of diode D2 connects resistance R 7.
4. colliery according to claim 1 multiloop comprehensive protector of motor; it is characterized in that: the short circuit (04) of adjusting of described overheated circuit of adjusting (03) and heat comprises the 3rd operational amplifier (IC3); four-operational amplifier (IC4); diode D4; diode D5; diode D9; diode D10; capacitor C 17; capacitor C 13; capacitor C 18; capacitor C 14; variable resistor RT4; variable resistor RT5; resistance R 15; resistance R 16; resistance R 17; resistance R 18; resistance R 19; resistance R 20; resistance R 21; resistance R 22; resistance R 23; resistance R 24; resistance R 25; resistance R 26; resistance R 27; resistance R 28; resistance R 29; resistance R 30
Connect the 15V operating voltage behind the in-phase input end series resistance R15 of the 3rd operational amplifier (IC3), the output of the 3rd operational amplifier (IC3) is series resistance R19 successively, be connected outlet line behind resistance R 20 and the diode D10, the positive pole of diode D10 connects resistance R 20, the in-phase input end of the 3rd operational amplifier (IC3) is connected output behind series resistance R16 and the diode D4 successively, the negative pole of diode D4 connects resistance R 16, the in-phase input end of the 3rd operational amplifier (IC3) connects parallel resistor R21, resistance R 22 and capacitor C 17 back ground connection, the inverting input of the 3rd operational amplifier (IC3) is connected incoming line after series resistance R18 and the resistance R 17 successively, the inverting input of the 3rd operational amplifier (IC3) connects capacitor C 13 back ground connection, ground connection behind the resistance R 19 connection variable resistor RT4;
The in-phase input end series resistance R25 of four-operational amplifier (IC4), be connected incoming line after resistance R 23 and the resistance R 17, the output of four-operational amplifier (IC4) is series resistance R29 successively, be connected outlet line behind resistance R 30 and the diode D9, the anodal resistance R 30 that connects of diode D9, the in-phase input end of four-operational amplifier (IC4) is connected output behind series resistance R24 and the diode D5 successively, the negative pole of diode D5 connects resistance R 24, the in-phase input end of four-operational amplifier (IC4) connects capacitor C 14 back ground connection, ground connection behind the resistance R 29 connection variable resistor RT5, connect the 15V operating voltage behind the inverting input series resistance R26 of four-operational amplifier (IC4), the inverting input of four-operational amplifier (IC4) connects parallel resistor R27, resistance R 28 and capacitor C 18 back ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220733731 CN203086112U (en) | 2012-12-27 | 2012-12-27 | Comprehensive multi-loop motor protector for coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220733731 CN203086112U (en) | 2012-12-27 | 2012-12-27 | Comprehensive multi-loop motor protector for coal mine |
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| Publication Number | Publication Date |
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| CN203086112U true CN203086112U (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220733731 Expired - Fee Related CN203086112U (en) | 2012-12-27 | 2012-12-27 | Comprehensive multi-loop motor protector for coal mine |
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| CN (1) | CN203086112U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549370A (en) * | 2016-10-27 | 2017-03-29 | 武汉船舶通信研究所 | A kind of detection protection circuit |
-
2012
- 2012-12-27 CN CN 201220733731 patent/CN203086112U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106549370A (en) * | 2016-10-27 | 2017-03-29 | 武汉船舶通信研究所 | A kind of detection protection circuit |
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| Date | Code | Title | Description |
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| 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: 20130724 Termination date: 20151227 |
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| EXPY | Termination of patent right or utility model |