CN201726098U - Multifunctional circuit for controlling and protecting switching device - Google Patents
Multifunctional circuit for controlling and protecting switching device Download PDFInfo
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- CN201726098U CN201726098U CN2010202992831U CN201020299283U CN201726098U CN 201726098 U CN201726098 U CN 201726098U CN 2010202992831 U CN2010202992831 U CN 2010202992831U CN 201020299283 U CN201020299283 U CN 201020299283U CN 201726098 U CN201726098 U CN 201726098U
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Abstract
The utility model discloses a multifunctional circuit for a controlling and protecting switching device, which comprises a microprocessor circuit, a signal sampling and processing circuit, a short circuit detection circuit, a tripping electromagnetic driving circuit, a control electromagnetic driving circuit and a power source switching circuit used for providing a power source for the above circuits. An input end of the short circuit detection circuit is connected with the sampling and processing circuit while an output end thereof is connected with the tripping electromagnetic driving circuit. The short circuit detection circuit can judge current signals from the signal sampling and processing circuit and controls actions of a tripping electromagnet. The multifunctional circuit for a controlling and protecting switching device can quickly output controlling and protective signals, and has strong anti-interference ability.
Description
Technical field
The utility model relates to the circuit of a kind of control and protection switch electrical equipment, relates in particular to the multifunctional circuit of a kind of control and protection switch electrical equipment, belongs to the low voltage electrical apparatus technology field.
Background technology
Control is a kind of staple product in low-voltage electrical apparatus field with protection switch electrical equipment, and this product the is integrated control and the defencive function of device for switching has the advantage that volume is little, function is strong.
At present, domestic part control and protection switch electrical equipment adopt the pyromagnetic protection of bimetal leaf, exist defencive function few, low precision, action problem of unstable.A domestic part is controlled with protection switch electrical equipment and has been used the electronics mode to protect, but all detects short trouble and output by analog circuit, and the short circuit judgement is undertaken by microprocessor, so exist software to judge the problem that the output action time is long.External part control and protection switch electrical equipment realized functions such as error protection by the integrated circuit electronic circuit, but function are comparatively single.
Chinese patent CN101217231A(was on July 9th, 2008 in open day) in the control and the protective circuit of a kind of control and protection switch electrical equipment are disclosed; as shown in Figure 1; its signal transfer mode is: signal sampling and treatment circuit 2 current signal is amplified and the current potential lifting after send into microcontroller circuit 1; after handling, current sampling circuit wide range signal in 3 pairs of signal sample circuits of short-circuit detecting circuit gives microcontroller circuit; judge whether the fault that is short-circuited by microcontroller circuit; providing control signal corresponding, to deliver to release electromagnet drive circuit 4(be the magnetic flow convertor control circuit); the magnetic flow convertor control circuit converts the low level signal that micro-processor interface circuit sends to high level signal through light-coupled isolation; thereby driving magnetic flow convertor; power-switching circuit 5 converts ac high voltage to DC low-voltage, thereby provides power supply for foregoing circuit.This transfer mode carries out short circuit by microprocessor and judges that the judgement time is long, thereby has the problem that causes the output action signal lag long.In addition, this circuit can not be controlled the control and the control electromagnet of protection switch electrical equipment, has only defencive function (driving magnetic flow convertor), no controlled function (control electromagnet branch, close), so on function, there is defective.
Summary of the invention
Technical problem to be solved in the utility model provides the multifunctional circuit of a kind of control and protection switch electrical equipment, can export control and protection signal fast, and antijamming capability is strong.
The utility model is to solve the problems of the technologies described above the multifunctional circuit that the technical scheme that adopts provides a kind of control and protection switch electrical equipment; comprise microcontroller circuit; signal sampling and treatment circuit; short-circuit detecting circuit; the release electromagnet drive circuit; control solenoid driver circuit and the power-switching circuit that power supply is provided for foregoing circuit; the input of described microcontroller circuit received signal sampling and treatment circuit; and be the release electromagnet drive circuit; the control solenoid driver circuit provides the output control signal; wherein; the input of described short-circuit detecting circuit links to each other with sampling and treatment circuit; output links to each other with the release electromagnet drive circuit; described short-circuit detecting circuit is to judging from current signal in signal sampling and the treatment circuit; set short circuit action threshold value if exceed; then directly export trip signal to release electromagnet and drive, thus the action of control release electromagnet.
The multifunctional circuit of above-mentioned control and protection switch electrical equipment; wherein; described multifunctional circuit also comprises the control voltage feedback circuit; described control voltage feedback circuit input links to each other with the control solenoid driver circuit; output links to each other with microcontroller circuit; described control voltage feedback circuit detects control solenoid driver circuit control voltage signal and is transferred to microcontroller circuit; described microcontroller circuit judges that the control voltage signal provides control signal corresponding to controlling solenoid driver circuit, thereby to the high-speed double electromagnet FEEDBACK CONTROL.
The multifunctional circuit of above-mentioned control and protection switch electrical equipment; wherein; described short-circuit detecting circuit comprises voltage comparator U3A; U3B; U3C; U3D; U4A; U4B and resistance R 10; 11 pin of voltage comparator U3D; 7 pin of voltage comparator U3A; 7 pin of voltage comparator U4A are connected with reference voltage VR+; 8 pin of voltage comparator U3C; 4 pin of voltage comparator U3B; 4 pin of voltage comparator U4B are connected with reference voltage VR-; 10 pin of voltage comparator U3D; 9 pin of voltage comparator U3C are connected with signal sample circuit signal IA1; 6 pin of voltage comparator U3A; 5 pin of voltage comparator U3B are connected with signal sample circuit signal IB1; 6 pin of voltage comparator U4A; 5 pin of voltage comparator U4B are connected with signal sample circuit signal IC1; 13 pin of voltage comparator U3A; 14 pin of voltage comparator U3B; 1 pin of voltage comparator U3C; 2 pin of voltage comparator U3D; 1 pin of voltage comparator U4A; 2 pin of voltage comparator U4B are connected with 1 pin of resistance R 10, and 2 pin of resistance R 10 are connected with power supply VCC1.
The multifunctional circuit of above-mentioned control and protection switch electrical equipment; wherein; described control voltage feedback circuit comprises operational amplifier U6A; U6B; optocoupler OP1; OP2; capacitor C 3; resistance R 14; R15; R16; R17; R18; R19; R20; R21; R22; R23; R24; R25; R26; R27; R28; 1 pin of resistance R 14 be connected isolator; 1 pin of 2 pin and resistance R 15; 1 pin of resistance R 21 connects; 2 pin of resistance R 15 and 1 pin of resistance R 16; 1 pin of resistance R 19 connects; 2 pin of resistance R 16 are connected with power supply VCC4; 1 pin of resistance R 17 is connected with the voltage signal of control solenoid driver circuit; 1 pin of 2 pin and resistance R 18; 1 pin of capacitor C 3; 1 pin of resistance R 20; 1 pin of resistance R 22 connects; 2 pin of resistance R 18 be connected isolator; 2 pin of resistance R 19 and 1 pin of resistance R 23; 3 pin of operational amplifier U6A connect; 2 pin of resistance R 20 are connected with 2 pin of operational amplifier U6A; 2 pin of resistance R 23 and 1 pin of operational amplifier U6A; 1 pin of resistance R 25 connects; 11 pin of operational amplifier U6A be connected isolator; 2 pin of resistance R 25 are connected with 1 pin of optocoupler OP1; 2 pin of optocoupler OP1 be connected isolator; 3 pin of optocoupler OP1 are connected with 1 pin of resistance R 27; 4 pin of optocoupler OP1 and 4 pin of optocoupler OP2; 2 pin of resistance R 28 connect; 2 pin of resistance R 27 are connected with ground; 2 pin of resistance R 21 and 1 pin of resistance R 24; 5 pin of operational amplifier U6B connect; 2 pin of resistance R 22 are connected with 6 pin of operational amplifier U6B; 2 pin of resistance R 24 and 7 pin of operational amplifier U6B; 1 pin of resistance R 26 connects; 2 pin of resistance R 26 are connected with 1 pin of optocoupler OP2; 2 pin of optocoupler OP2 be connected isolator, 3 pin of optocoupler OP2 are connected with ground.
The utility model contrast prior art has following beneficial effect: the multifunctional circuit of control that the utility model provides and protection switch electrical equipment; short-circuit detecting circuit judges that to current signal the back directly drives the release electromagnet drive circuit; the judgement time is short; the output action signal time is rapid, and antijamming capability is strong.In addition, the utility model is realized FEEDBACK CONTROL by increasing the control voltage feedback circuit to solenoid driver circuit, guarantees the reliability of control.
Description of drawings
Fig. 1 is the multifunctional circuit structural representation of existing control and protection switch electrical equipment;
Fig. 2 is the multifunctional circuit structural representation of control of the present utility model and protection switch electrical equipment;
Fig. 3 is signal sampling of the present utility model and treatment circuit and microcontroller circuit schematic diagram;
Fig. 4 is a short-circuit detecting circuit schematic diagram of the present utility model;
Fig. 5 is a control solenoid driver circuit schematic diagram of the present utility model;
Fig. 6 is a release electromagnet drive circuit schematic diagram of the present utility model;
Fig. 7 is a control voltage feedback circuit schematic diagram of the present utility model.
Among the figure:
1 microcontroller circuit, 2 signal samplings and treatment circuit 3 short-circuit detecting circuits
4 release electromagnet drive circuits, 5 power-switching circuits, 6 control voltage feedback circuits
7 control solenoid driver circuits
Embodiment
The utility model will be further described below in conjunction with drawings and Examples.
Fig. 2 is the multifunctional circuit structural representation of control of the present utility model and protection switch electrical equipment.
See also Fig. 2; the multifunctional circuit of control that the utility model provides and protection switch electrical equipment comprises microcontroller circuit 1; signal sampling and treatment circuit 2; short-circuit detecting circuit 3; release electromagnet drive circuit 4; control solenoid driver circuit 7 and the power-switching circuit 5 that power supply is provided for foregoing circuit; the input of described microcontroller circuit 1 received signal sampling and treatment circuit 2; and be release electromagnet drive circuit 4; control solenoid driver circuit 7 provides the output control signal; wherein; the input of described short-circuit detecting circuit 3 links to each other with sampling and treatment circuit 2; output links to each other with release electromagnet drive circuit 4; 3 pairs of described short-circuit detecting circuits are judged from current signal in signal sampling and the treatment circuit 2; set short circuit action threshold value if exceed; then directly export trip signal to release electromagnet and drive 4, thus the action of control release electromagnet.
Signal sampling and treatment circuit 2 are gathered current signal and signal are carried out being transferred to microcontroller circuit 1 after the processing and amplifying, microcontroller circuit 1 judges whether break down, provide control signal corresponding to release electromagnet drive circuit 4, thereby control release electromagnet action, current signal is judged in 3 pairs of signal samplings of short-circuit detecting circuit and the treatment circuit, set short circuit action threshold value if exceed, then export trip signal to release electromagnet and drive 4, thereby control release electromagnet action, control voltage feedback circuit 6 detects control solenoid driver circuit 7 control voltage signals and is transferred to microcontroller circuit 1, microcontroller circuit 1 judges that the control voltage signal provides control signal corresponding to controlling solenoid driver circuit 7, thereby control electromagnet action, power-switching circuit 5 becomes the internal insulation LVPS with the external high voltage power source conversion, for other circuit workings provide energy.
Existing solenoid driver circuit according to self electromagnet characteristic guarantee standard code greater than 85% rated voltage the time adhesive, discharge during less than 70% rated voltage, but the voltage range of work is narrow, the characteristic instability of each action is variant, multifunctional circuit of the present utility model then can adopt microprocessor to judge, pulse width modulation controlled and detection feedback voltage, adhesive when making electromagnet greater than 75% rated voltage, discharge during less than 50% rated voltage, operating voltage range is wide, and the each action of electromagnet is stable, high conformity, electromagnet is energy-conservation, advantages such as it is little to generate heat.
Fig. 3 is signal sampling of the present utility model and treatment circuit and microcontroller circuit schematic diagram.
See also Fig. 3, microcontroller circuit 1 of the present utility model adopts high-performance microprocessor, have multi-analog to the digital quantity translation function, can sample and convert digital quantity to analog signals and handle, make corresponding judgement and provide action output by output pin.It (is example with A among the figure mutually that signal sampling and treatment circuit 2 adopts Hall chip H1 sampling A phase current signals, B, the identical A phase of C), operational amplifier U1A is connected with reference voltage V r1 and by R1 resistance FEEDBACK CONTROL triode Q1, thereby for Hall chip H1 provides the constant current working power, operational amplifier U1B, U1C follows processing with the sampling differential voltage signal of Hall chip H1 output, be transferred to late-class circuit respectively, resistance R 2, R3, R4, R5 and operational amplifier U2A form the wide range differential amplifier circuit, current signal is carried out small scale to be amplified, output wide range signal IA1, resistance R 6, R7, R8, R9 and operational amplifier U2B form a small amount of path difference and divide amplifying circuit, current signal is carried out vast scale amplify, output is journey signal IA2 in a small amount.In like manner, obtain B phase wide range signal IB1, a small amount of journey signal IB2, C phase wide range signal IC1, journey signal IC2 in a small amount.Signal IA1, IA2, IB1, IB2, IC1, IC2 are transferred to microprocessor respectively and sample, and synchronous signal IA1, IB1, IC1 are transferred to short-circuit detecting circuit and handle.
Fig. 4 is a short-circuit detecting circuit schematic diagram of the present utility model.
See also Fig. 4, short-circuit detecting circuit of the present utility model 3 is composed as follows: voltage comparator U3D is according to reference voltage VR+, judge whether input signal IA1 maximum exceeds threshold value, otherwise then export trip signal and then do not export if exceed, voltage comparator U3C is according to reference voltage VR-, judge whether input signal IA1 minimum value exceeds threshold value, otherwise then export trip signal and then do not export if exceed, voltage comparator U3A, U4A principle are with voltage comparator U3D, and voltage comparator U3B, U4B principle are with voltage comparator U3C.Voltage comparator U3A, U3B, U3C, U3D, U4A, U4B output-parallel are as 1 or above voltage comparator output trip signal this short-circuit detecting circuit output short-circuit trip signal then.
Fig. 5 is a control solenoid driver circuit schematic diagram of the present utility model.
See also Fig. 5, control solenoid driver circuit of the present utility model is composed as follows: control signal is transferred to optocoupler OP3 by resistance R 29, through isolating by resistance R 30, R31 control triode Q3, thereby control pulse width modulating chip U8, resistance R 35, the power supply of resistance R 36 cut-offs, the external power source electric current is from input AC1, AC2 also passes through metal-oxide-semiconductor Q4 with power transfer to the control electromagnet by rectifier bridge, resistance R 37, R38 returns, pulse width modulating chip U8 cut-offs by resistance R 33 control metal-oxide-semiconductor Q4's, resistance R 32 is formed the output frequency that delay circuit determines pulse width modulating chip U8 with capacitor C 4, resistance R 37, the last generation of R38 voltage feedback signal feeds back to pulse width modulating chip U8 through resistance R 34, resistance R 35, R36, R37, R38, R39, diode D3, capacitor C 5, operational amplifier U7A, metal-oxide-semiconductor Q5 forms the starting of control electromagnet, keep the differentiation operating circuit, when resistance R 35, when R36 powers on, 35 pairs of capacitor C 5 of resistance R are charged, operational amplifier U7A compares voltage on capacitor C 5 and the resistance R 39, the output high level signal is to metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q5 conducting, resistance R 37, R38 shunt circuit resistance diminishes, the electric current that flows through Q4 is simultaneously by resistance R 37, R38, the feedback voltage that is transferred to pulse width modulating chip U8 diminishes, thereby make the pulse duty cycle of pulse width modulating chip U8 output become big, flow through the control current of electromagnet and become big, this is control electromagnet starting current, when capacitor C 5 chargings are finished, voltage on the capacitor C 5 is greater than the voltage on the resistance R 39, the operational amplifier output low level, metal-oxide-semiconductor Q5 turn-offs, resistance R 37 breaks loop resistance and becomes big from the loop, the feedback voltage that is transferred to pulse width modulating chip U8 becomes big, thereby make the pulse duty cycle of pulse width modulating chip U8 output diminish, flowing through the control current of electromagnet diminishes, this is the electric current of keeping of control electromagnet, electric current is by the anti-phase afterflow of diode D1 in the control electromagnet, guarantee to control electromagnet and keep constant current, thereby make the control electromagnet keep attracting state at metal-oxide-semiconductor Q5 shutdown moment.Diode D3 discharges the electric energy in the capacitor C 5 when triode Q3 turn-offs, thus make next when electric capacitor C 5 can charge normal.
Fig. 6 is a release electromagnet drive circuit schematic diagram of the present utility model.
See also Fig. 6, release electromagnet drive circuit of the present utility model is composed as follows: trip signal is transferred to monostable chip U5 through resistance R 11, monostable chip U5 produces pulse output and is transferred to metal-oxide-semiconductor Q2 through R13, R12 and C1 form delay circuit, decision pulse output width, VCC2 and capacitor C 2 provide energy to release electromagnet simultaneously when the Q2 conducting, thereby drive the release electromagnet action, when Q2 turn-offs, electric current is by the anti-phase afterflow of diode D1 in the release electromagnet, and avoiding producing in the release electromagnet coil instantaneous pressure influences circuit element.
Fig. 7 is a control voltage feedback circuit schematic diagram of the present utility model.
See also Fig. 7, control voltage feedback circuit of the present utility model is composed as follows: transmit next voltage signal Udc through resistance R 17 from the control solenoid driver circuit, the R18 dividing potential drop, and through capacitor C 3 filtering, form d. c. voltage signal and be transferred to resistance R 20, R22, resistance R 14, R15, R16 forms bleeder circuit, for late-class circuit provides 2 reference voltages, resistance R 19, R20, R23, operational amplifier U6A forms the voltage hysteresis comparator circuit, to control voltage signal and reference voltage and compare the corresponding high-low level of back output, this level drives optocoupler OP1 by resistance R 25, make optocoupler OP1 conducting or shutoff, the output isolation signals is to Uc, resistance R 21, R22, R24, operational amplifier U6B forms the voltage hysteresis comparator circuit, to control voltage signal and reference voltage and compare the corresponding high-low level of back output, this level drives optocoupler OP2 by resistance R 26, make optocoupler OP2 conducting or shutoff, the output isolation signals is to Uc, and isolation signals is by resistance R 27, R28 is at optocoupler OP1, the different conductings of OP2, off state output different amplitude voltage signals to microprocessor down carries out sampling processing.
After the high-voltage power supply that power-switching circuit described in the utility model inserts the outside is handled by current rectifying and wave filtering circuit, isolating transformer, voltage chopping control circuit, the LVPS that output multichannel and external voltage are isolated is for inner other circuit provide energy.
Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection range of the present utility model is worked as with being as the criterion that claims were defined.
Claims (4)
1. the multifunctional circuit of control and protection switch electrical equipment; comprise microcontroller circuit (1); signal sampling and treatment circuit (2); short-circuit detecting circuit (3); release electromagnet drive circuit (4); control solenoid driver circuit (7) and the power-switching circuit (5) that power supply is provided for foregoing circuit; the input of sampling of described microcontroller circuit (1) received signal and treatment circuit (2); and be release electromagnet drive circuit (4); control solenoid driver circuit (7) provides the output control signal; it is characterized in that; the input of described short-circuit detecting circuit (3) links to each other with sampling and treatment circuit (2); output links to each other with release electromagnet drive circuit (4); described short-circuit detecting circuit (3) is to judging from current signal in signal sampling and the treatment circuit (2); set short circuit action threshold value if exceed; then directly export trip signal to release electromagnet and drive (4), thus the action of control release electromagnet.
2. the multifunctional circuit of control as claimed in claim 1 and protection switch electrical equipment; it is characterized in that; described multifunctional circuit also comprises control voltage feedback circuit (6); described control voltage feedback circuit (6) input links to each other with control solenoid driver circuit (7); output links to each other with microcontroller circuit (1); described control voltage feedback circuit (6) detects control solenoid driver circuit (7) control voltage signal and is transferred to microcontroller circuit (1); described microcontroller circuit (1) judges that the control voltage signal provides control signal corresponding to controlling solenoid driver circuit (7), thereby to the high-speed double electromagnet FEEDBACK CONTROL.
3. the multifunctional circuit of control as claimed in claim 1 and protection switch electrical equipment; it is characterized in that; described short-circuit detecting circuit (3) comprises voltage comparator U3A; U3B; U3C; U3D; U4A; U4B and resistance R 10; 11 pin of voltage comparator U3D; 7 pin of voltage comparator U3A; 7 pin of voltage comparator U4A are connected with reference voltage VR+; 8 pin of voltage comparator U3C; 4 pin of voltage comparator U3B; 4 pin of voltage comparator U4B are connected with reference voltage VR-; 10 pin of voltage comparator U3D; 9 pin of voltage comparator U3C are connected with signal sample circuit signal IA1; 6 pin of voltage comparator U3A; 5 pin of voltage comparator U3B are connected with signal sample circuit signal IB1; 6 pin of voltage comparator U4A; 5 pin of voltage comparator U4B are connected with signal sample circuit signal IC1; 13 pin of voltage comparator U3A; 14 pin of voltage comparator U3B; 1 pin of voltage comparator U3C; 2 pin of voltage comparator U3D; 1 pin of voltage comparator U4A; 2 pin of voltage comparator U4B are connected with 1 pin of resistance R 10, and 2 pin of resistance R 10 are connected with power supply VCC1.
4. the multifunctional circuit of control as claimed in claim 1 and protection switch electrical equipment; it is characterized in that; described control voltage feedback circuit (6) comprises operational amplifier U6A; U6B; optocoupler OP1; OP2; capacitor C 3; resistance R 14; R15; R16; R17; R18; R19; R20; R21; R22; R23; R24; R25; R26; R27; R28; 1 pin of resistance R 14 be connected isolator; 1 pin of 2 pin and resistance R 15; 1 pin of resistance R 21 connects; 2 pin of resistance R 15 and 1 pin of resistance R 16; 1 pin of resistance R 19 connects; 2 pin of resistance R 16 are connected with power supply VCC4; 1 pin of resistance R 17 is connected with the voltage signal of control solenoid driver circuit; 1 pin of 2 pin and resistance R 18; 1 pin of capacitor C 3; 1 pin of resistance R 20; 1 pin of resistance R 22 connects; 2 pin of resistance R 18 be connected isolator; 2 pin of resistance R 19 and 1 pin of resistance R 23; 3 pin of operational amplifier U6A connect; 2 pin of resistance R 20 are connected with 2 pin of operational amplifier U6A; 2 pin of resistance R 23 and 1 pin of operational amplifier U6A; 1 pin of resistance R 25 connects; 11 pin of operational amplifier U6A be connected isolator; 2 pin of resistance R 25 are connected with 1 pin of optocoupler OP1; 2 pin of optocoupler OP1 be connected isolator; 3 pin of optocoupler OP1 are connected with 1 pin of resistance R 27; 4 pin of optocoupler OP1 and 4 pin of optocoupler OP2; 2 pin of resistance R 28 connect; 2 pin of resistance R 27 are connected with ground; 2 pin of resistance R 21 and 1 pin of resistance R 24; 5 pin of operational amplifier U6B connect; 2 pin of resistance R 22 are connected with 6 pin of operational amplifier U6B; 2 pin of resistance R 24 and 7 pin of operational amplifier U6B; 1 pin of resistance R 26 connects; 2 pin of resistance R 26 are connected with 1 pin of optocoupler OP2; 2 pin of optocoupler OP2 be connected isolator, 3 pin of optocoupler OP2 are connected with ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202992831U CN201726098U (en) | 2010-08-20 | 2010-08-20 | Multifunctional circuit for controlling and protecting switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202992831U CN201726098U (en) | 2010-08-20 | 2010-08-20 | Multifunctional circuit for controlling and protecting switching device |
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| Publication Number | Publication Date |
|---|---|
| CN201726098U true CN201726098U (en) | 2011-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202992831U Expired - Lifetime CN201726098U (en) | 2010-08-20 | 2010-08-20 | Multifunctional circuit for controlling and protecting switching device |
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| CN (1) | CN201726098U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924343A (en) * | 2010-08-20 | 2010-12-22 | 上海电科电器科技有限公司 | Multifunctional circuit for controlling and protecting switching apparatus |
-
2010
- 2010-08-20 CN CN2010202992831U patent/CN201726098U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924343A (en) * | 2010-08-20 | 2010-12-22 | 上海电科电器科技有限公司 | Multifunctional circuit for controlling and protecting switching apparatus |
| CN101924343B (en) * | 2010-08-20 | 2012-12-12 | 上海电科电器科技有限公司 | Multifunctional circuit for controlling and protecting switching apparatus |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110126 |
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| CX01 | Expiry of patent term |