CN2508383Y - Numerically-controlled ac contactor - Google Patents
Numerically-controlled ac contactor Download PDFInfo
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- CN2508383Y CN2508383Y CN 01257952 CN01257952U CN2508383Y CN 2508383 Y CN2508383 Y CN 2508383Y CN 01257952 CN01257952 CN 01257952 CN 01257952 U CN01257952 U CN 01257952U CN 2508383 Y CN2508383 Y CN 2508383Y
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Abstract
The utility model discloses a digital control alternating current contactor, which solves the problems that the vibration of the alternating current contactor is large and the noise is high, and comprises a casing, a normally open contact, and an operating coil controlling the operation of the normally open contact. After the operating coil is electrically connected with a voiceless power saving circuit which comprises a voltage reducing rectification module processing the current outputted by a power and controlling the operation of the operating coil, the operating coil forms a return circuit with the power, the power is connected with a voltage reducing rectification circuit which comprises the voltage reducing rectification module operating the voltage reducing rectification processing to the current inputted by the power in the return circuit, the voltage reducing rectification circuit operates the voltage stabilizing filter processing to an electric signal through a voltage stabilizing filtering circuit, and then the voltage reducing rectification circuit is electrically connected with the input end of a digital controlling circuit, the digital controlling circuit comprises an analog digital time-base module which makes the electric signal changed into a digital pattern, and the analog digital time-base module is electrically connected with the voiceless power saving circuit to form the other return circuit. The utility model has the advantages of shockproofness, noiselessness, small power consumption, small resistance of contact head contact, long service life, etc.
Description
Technical field the utility model relates to a kind of control device of Electric Traction, especially relates to a kind of digital control A.C. contactor.
Background technology is present, A.C. contactor on the market is directly to impose the adhesive that rated voltage is come control contactor at its pull-in winding two ends, though this method is simple, but it produces very big vibration in use, the alternating electromagnetic noise is arranged, shortcomings such as power consumption is big, a kind of intelligent AC contactor of 00214192 patent No. is disclosed on the Chinese patent communique is, the contact system of its contactor three-phase moving contact and movable contact bridge when open position are installed on the contact supporting, contact supporting is installed on the moving iron core, it can be realized few arc or not have arc and cut-off, but also have above-mentioned shortcoming, do not see also on the Chinese patent communique that the A.C. contactor of digital control is open.
The summary of the invention the purpose of this utility model provides a kind of shockproof, noiselessness of Digital Circuit Control, the A.C. contactor that power consumption is little.
The utility model is achieved in that the digital control of the application A.C. contactor includes shell, make contact, the pull-in winding of control make contact action, pull-in winding is electrically connected one and includes that the step-down rectifier module handles the electric current of power supply input, behind the silent power-saving circuit of control pull-in winding action, form a loop with power supply, in this loop, power supply also includes the step-down rectifier module with one, electric current to the power supply input carries out the step-down rectifying circuit connection that step-down rectifier is handled, step-down rectifying circuit carries out voltage regulation filtering by filter circuit of pressure-stabilizing to the signal of telecommunication and handles the input that is electrically connected digital control circuit again, digital control circuit comprises an analog digital time base module, and it is figure pattern with electrical signal conversion and is electrically connected the silent power-saving circuit and constitutes another loop.
The silent power-saving circuit also include with step-down rectifier module I C1 pin 1 that be electrically connected in parallel with capacitor C 1, resistance R 2 in parallel with resistance R 1 again after, the branch road of connecting with the contact of relay J; Step-down rectifier module I C1 pin 2 is electrically connected and the pull-in winding parallel resistor R3 of A.C. contactor CJ and series circuit, the diode D2 of capacitor C 2 through diode D1, and forms the loop with step-down rectifier module I C1 pin 3.
Step-down rectifying circuit also includes the resistance R 4 and capacitor C 3 parallel circuitss that is electrically connected with step-down rectifier module I C2 pin 1.
Described filter circuit of pressure-stabilizing includes Voltage stabilizing module IC3, Voltage stabilizing module IC3 pin 1 and connects the end of capacitor C 4, C5 and be electrically connected with step-down rectifier module I C2; Voltage stabilizing module IC3 pin 2 and capacitor C 6, C7 one end; The other end of Voltage stabilizing module IC3 pin 3 and capacitor C 4, C5, C6, C7 and connecing again is electrically connected with step-down rectifier module I C2.
Digital control circuit also includes digital control branch road and monostable circuit.
Digital control circuit can also include by LED 1, LED2 and high-low pressure indicating circuit in parallel again after resistance R 9, R10 connect, and the LED 2 of high-low pressure indicating circuit is electrically connected with monostable circuit 3 by triode BG1.
Digital control branch road includes NAND gate integrated circuit (IC) 4, and filter circuit of pressure-stabilizing is electrically connected with door 1, the door 3 of NAND gate integrated circuit (IC) 4, and door 3 also is electrically connected with monostable circuit; Door 1 is connected on the adjustable resistance W1, and this adjustable resistance W1 series resistance R5 is connected with step-down rectifier module I C2 pin 2, and door 1 also connects with the circuit that triode BG1 is connected with step-down rectifier module I C2 pin 2; The door 4 of NAND gate integrated circuit (IC) 4 is electrically connected with the high-low pressure indicating circuit, also is connected on the connecting circuit that is connected to door 1 and adjustable resistance W1 with resistance R 6, also is connected with door 1,2 line, and this line also is connected with the base stage of triode BG1; Door 2 be connected in adjustable resistance W2 and resistance R 7 be connected in series in 3 also with circuit that monostable circuit is electrically connected on.
Described monostable circuit includes monostable flipflop IC5, monostable flipflop IC5 pin 3 is connected to and is connected to after the relay J on triode BG1 and the circuit that step-down rectifier module I C2 pin 2 is connected, monostable flipflop IC5 pin 8, pin 4 are parallel to the resistance R 8 among the monostable flipflop IC5, the series circuit of electrochemical capacitor C8 after connecting, and monostable flipflop IC5 pin 2 is electrically connected with digital control branch road.
Digital control circuit can also adopt this technical scheme, include analog digital time base module IC6, the pin 2 of analog digital time base module IC6, after connecting, pin 6 is connected on the adjustable resistance W, this adjustable resistance W connects with diode 2CW2 with capacitor C 11 parallel connections with resistance R 5 serial connection backs again and forms a branch road, this branch road one is terminated at step-down rectifier module I C2 pin 2 on the loop of pin 8 formation of diode D3 and analog digital time base module IC6, this loop resistance R 13 also in parallel and with the pin 14 of analog digital time base module IC6, pin 10, pin 4, the end that pin 13 is connected in series with resistance R 12, pin 5 links to each other with an end of capacitor C 14 serial connections, step-down rectifier module I C2 pin 3 is through the loop of capacitor C 15 with pin 12 formation of analog digital time base module IC6, also receive on the line of the pin 13 of time base module IC6 and resistance R 12 in this loop, this loop also with the pin 7 of analog digital time base module IC6, one end of pin 3 serial connection capacitor C 12, one end of pin 11 serial connection capacitor C 13, one end of the indicating circuit that pin 9 serial connection relay J reach and connect is connected.
Described filter circuit of pressure-stabilizing can also be capacitor C 10 circuit in parallel with diode 2CW1.
After adopting above-mentioned technology, traditional control method has changed the independent silent power-saving circuit that constitutes the loop voluntarily into, this circuit becomes direct current with the alternating current of importing and inputs to the contactor pull-in winding, and adopt digital logical circuit to control the silent power-saving circuit, again by silent power-saving circuit control contactor coil, because digital circuit logic function is strong, can produce accurate control level, have stable, reliably, low characteristics consume energy, make the application's A.C. contactor shockproof in use, noiselessness, power consumption is little, long service life, owing to have under-voltage, the overvoltage running control circuit, so in the scope of the 60%-120% of input rated voltage, all can normally use, because the module that the utility model adopts is integrated IC module commonly used, structure is also simple, the specific signal that inserts the input of its analog digital time base module can realize that multiple function is used for A.C. contactor as time-delay etc., and can be connected the realization Based Intelligent Control with the computer interface circuit by the photoelectricity coupling.
Description of drawings Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is the circuit diagram of a kind of execution mode of the present utility model;
Fig. 3 is the circuit diagram of another kind of execution mode of the present utility model.
The utility model is described in further detail below in conjunction with the drawings and specific embodiments for embodiment.
As shown in Figure 1, digital control exchanges contact and includes shell, make contact, the pull-in winding of control make contact action, pull-in winding is electrically connected one and includes that the step-down rectifier module handles the electric current of power supply input, behind the silent power-saving circuit of control pull-in winding action, form a loop with power supply, in this loop, power supply also includes the step-down rectifier module with one, electric current to the power supply input carries out the step-down rectifying circuit connection that step-down rectifier is handled, step-down rectifying circuit carries out voltage regulation filtering by filter circuit of pressure-stabilizing to the signal of telecommunication and handles the input that is electrically connected digital control circuit again, digital control circuit comprises an analog digital time base module, and it is figure pattern with electrical signal conversion and is electrically connected the silent power-saving circuit and constitutes another loop.
Step-down rectifying circuit also includes the resistance R 4 and capacitor C 3 parallel circuitss that is electrically connected with step-down rectifier module I C2 pin 1.
Described filter regulator circuit includes Voltage stabilizing module IC3, Voltage stabilizing module IC3 pin 1 and connects the end of capacitor C 4, C5 and be electrically connected with step-down rectifier module I C2; Voltage stabilizing module IC3 pin 2 and capacitor C 6, C7 one end; The other end of Voltage stabilizing module IC3 pin 3 and capacitor C 4, C5, C6, C7 and connecing again is electrically connected with step-down rectifier module I C2.
Described filter regulator circuit can also adopt the circuit of capacitor C 10 and diode 2CW1 formation in parallel.
In the such scheme, digital control circuit can be made up of digital control branch road and monostable circuit and can also include by LED 1, LED2 and high-low pressure indicating circuit in parallel again after resistance R 9, R10 connect, and the LED 2 of high-low pressure indicating circuit is connected with the negative pole of stabilized voltage power supply by triode BG1.
As shown in Figure 2, in the such scheme, digital control circuit also can include analog digital time base module IC6, the pin 2 of analog digital time base module IC6, after connecting, pin 6 is connected on the adjustable resistance W, this adjustable resistance W connects with diode 2CW2 with capacitor C 11 parallel connections with resistance R 5 serial connection backs again and forms a branch road, this branch road one is terminated at step-down rectifier module I C2 pin 2 on the loop of pin 8 formation of diode D3 and analog digital time base module IC6, this loop resistance R 13 also in parallel and with the pin 14 of analog digital time base module IC6, pin 10, pin 4, the end that pin 13 is connected in series with resistance R 12, pin 5 links to each other with an end of capacitor C 14 serial connections, step-down rectifier module I C2 pin 3 is through the loop of capacitor C 15 with pin 12 formation of analog digital time base module IC6, also receive on the line of the pin 13 of time base module IC6 and resistance R 12 in this loop, this loop also with the pin 7 of analog digital time base module IC6, one end of pin 3 serial connection capacitor C 12, one end of pin 11 serial connection capacitor C 13, one end of the indicating circuit that pin 9 serial connection relay J reach and connect is connected.
Analog digital time base module IC6 is that the analog-and digital-function of collection is the integrated circuit of one, its pin 2, pin 6 are formed trigger with diode 2CW2, resistance R 5, adjustable resistance W, when civil power is lower than the lower limit of variable resistor W setting, the pin 2 of time base module IC6, pin 6, pin 9 are low level " 0 " pin 5, pin 8 is " 1 ", because of pin 9 is low level " 0 " not adhesive of relay J, A.C. contactor CJ does not start.
When civil power surpasses the higher limit of variable resistor W setting, diode 2CW2 punctures conducting, in conducting moment because the effect of capacitor C 11, the pin 2 of time base module IC6, pin 6 are low level " 0 ", and capacitor C 11 to 2/3VDD, causes the upset of time base module IC6 trigger by diode 2CW2 very charging quickly, pin 5 outputs of time base module IC6 become " 0 ", this low level forms a negative pulse through resistance R 13, capacitor C 14 differential and adds to pin 8, makes pin 9 set outputs " 1 ", the relay J adhesive.
Because relay J adhesive, its normally opened contact closure, connect the start-up circuit of contactor, A.C. contactor CJ adhesive under total head, time base module IC6 pin 9 outputs " 1 " this moment are a kind of temporarily steady state, the internal discharge triode of time base module IC6 ends, VDD is by 15 chargings of 12 pairs of capacitor C of resistance R, make the voltage on the capacitor C 15 be the index rising, when the voltage of capacitor C 15 is charged to greater than 2/3VDD, during the threshold voltage of its module I C6 pin 12, the upset of time base module IC6 trigger resets when reaching, pin 9 outputs " 0 ", at this moment, internal discharge triode saturation conduction, the electric charge on the capacitor C 15 is discharged to low level " 0 " rapidly through the discharge triode, and circuit recovers stable state.
As Fig. 2, shown in Figure 3, step-down rectifying circuit includes the resistance R 4 and capacitor C 3 parallel circuitss that is electrically connected with step-down rectifier module I C2 pin 1.
Among Fig. 2, when digital control circuit adopts analog digital time base module IC6, the silent power-saving circuit can adopt power supply output to be connected to relay J series resistor R1 and capacitor C 1 through K switch, be electrically connected with step-down rectifying circuit behind one end of resistance R 2 parallel connections, the contact series resistor R1 and the capacitor C 1 of relay J, the other end of resistance R 2 parallel connections is electrically connected with step-down rectifier module I C1 pin 1, step-down rectifier module I C1 pin 2 be electrically connected with the pull-in winding parallel resistor R3 of A.C. contactor CJ and the series circuit of capacitor C 2, diode D2 connects with diode D1 afterwards and the branch road that is electrically connected with step-down rectifier module I C1 pin 3.
In such scheme, after the mains switch closure, be divided into two-way, the one tunnel exports direct current through step-down rectifier module I C1 starts and maintenance for A.C. contactor CJ; Another road again through diode 2CW1 voltage stabilizing, supplies time base module IC6 as the control power supply through the step-down rectifying circuit rectification after capacitor C 10 filtering.
As shown in Figure 3, the silent power-saving circuit can also adopt following scheme, power supply output is electrically connected with step-down rectifying circuit after K switch is connected to the input of sensitive switch LX, the output series resistor R1 of sensitive switch LX, the parallel circuits of another output series resistor R2 and capacitor C 1, the contact of serial connection relay J was electrically connected with step-down rectifier module I C1 pin 1 after two outputs connected,, step-down rectifier module I C1 pin 2 that be electrically connected with series circuit A.C. contactor CJ parallel resistor R3 and capacitor C 2, the branch road that is electrically connected with step-down rectifier module I C1 pin 3 after diode D2 connects with diode D1.
In the silent power-saving circuit, when the adhesive of the contact of relay J, its power supply is after resistance R 1 current limliting is delivered to step-down rectifier module I C1 rectification, transport to A.C. contactor CJ through diode D1, A.C. contactor CJ full voltage starting is after the pull-in winding adhesive of A.C. contactor CJ, relay J promptly discharges, cut off to start power supply, continue as A.C. contactor CJ and provide and keep electric current, A.C. contactor CJ is kept under dc low-voltage then change reduction voltage loop by capacitor C 1 and resistance R 2 parallel connections.
A.C. contactor CJ is an inductive load, can produce sizable back-emf in the moment of cutting off the power supply, and the anodal current potential that isolating diode D1 improves step-down rectifier module I C1 is set, diode D2 afterflow, and resistance R 3 is an overvoltage capacitance-resistance absorption circuit with the series circuit of capacitor C 2.
Adopt above-mentioned silent power-saving circuit, corresponding digital control circuit can adopt following structure, and digital control circuit also includes digital control circuit and monostable circuit.
Digital control circuit includes two and goes into to fail four NAND gate integrated circuit (IC) 4, and filter circuit of pressure-stabilizing is electrically connected with door 1, the door 3 of NAND gate integrated circuit (IC) 4, and door 3 also is electrically connected with monostable circuit; Door 1 is connected on the adjustable resistance W1, and this adjustable resistance W1 series resistance R5 is connected with step-down rectifier module I C2 pin 2, and door 1 also connects with the circuit that triode BG1 is connected with Voltage stabilizing module IC3 pin 3; The door 4 of NAND gate integrated circuit (IC) 4 is electrically connected with the high-low pressure indicating circuit, also is connected on the connecting circuit that is connected to door 1 and adjustable resistance W1 with resistance R 6, also is connected with door 1,2 line, and this line also is connected with the base stage of triode BG1; Door 2 be connected in adjustable resistance W2 and resistance R 7 be connected in series in 3 also with circuit that monostable circuit is electrically connected on.
Described monostable circuit includes monostable flipflop IC5, monostable flipflop IC5 pin 3 is connected to and is connected to triode BG1 collector electrode after the relay J on emitter, LED 2, resistance R 10 and circuit that Voltage stabilizing module IC3 pin 2 is connected, the series circuit of monostable flipflop IC5 pin 8, pin 4 connection backs and resistance R 8, electrochemical capacitor C8 also connects, and pin 2 is electrically connected with digital control circuit.
Digital control circuit also comprises can be by LED 1, LED2 and high-low pressure indicating circuit in parallel again after resistance R 9, R10 connect, and the LED 2 of high-low pressure indicating circuit is connected with the stabilized voltage power supply negative electricity by triode BG1.
In above-mentioned digital control circuit, LED 1 is under-voltage indicator light, LED 2 is the overvoltage indicator light, when civil power surpasses the higher limit of variable resistor W1 setting, two go into to fail 41 outputs of four NAND gate integrated circuit (IC) " 0 ", triode BG1 conducting, LED 2 is bright, door 2 outputs " 1 ", door 3 outputs " 0 " trigger monostable flipflop IC5, the relay J adhesive, and A.C. contactor CJ discharges because of cutting off the electricity supply, door 4 output " 1 " LEDs 1 do not work.
When civil power is lower than the lower limit of variable resistor W2 setting, two go into to fail 41 outputs of four NAND gate integrated circuit (IC) " 1 ", LED 2 does not work, door 2 outputs " 1 ", door 3, door 4 outputs " 0 ", LED 1 is bright, door 3 outputs " 0 ", trigger monostable flipflop IC5, the relay J adhesive, A.C. contactor CJ discharges because of cutting off the electricity supply.
Claims (10)
1, digital control A.C. contactor, include shell, make contact, the pull-in winding of control make contact action, it is characterized in that: pull-in winding is electrically connected one and includes that the step-down rectifier module handles the electric current of power supply input, behind the silent power-saving circuit of control pull-in winding action, form a loop with power supply, in this loop, power supply also includes the step-down rectifier module with one, electric current to the power supply input carries out the step-down rectifying circuit connection that step-down rectifier is handled, step-down rectifying circuit carries out voltage regulation filtering by filter circuit of pressure-stabilizing to the signal of telecommunication and handles the input that is electrically connected digital control circuit again, digital control circuit comprises an analog digital time base module, and it is figure pattern with electrical signal conversion and is electrically connected the silent power-saving circuit and constitutes another loop.
2, digital control A.C. contactor according to claim 1, it is characterized in that: the silent power-saving circuit also include with step-down rectifier module I C1 pin 1 that be electrically connected in parallel with capacitor C 1, resistance R 2 in parallel with resistance R 1 again after, the branch road of connecting with the contact of relay J; Step-down rectifier module I C1 pin 2 is electrically connected and the pull-in winding parallel resistor R3 of A.C. contactor CJ and series circuit, the diode D2 of capacitor C 2 through diode D1, and forms the loop with step-down rectifier module I C1 pin 3.
3, digital control A.C. contactor according to claim 1, it is characterized in that: step-down rectifying circuit also includes the resistance R 4 and capacitor C 3 parallel circuitss that is electrically connected with step-down rectifier module I C2 pin 1.
4, according to claim 1 or 2 or 3 described digital control A.C. contactors, it is characterized in that: described filter circuit of pressure-stabilizing includes Voltage stabilizing module IC3, Voltage stabilizing module IC3 pin 1 and connects the end of capacitor C 4, C5 and be electrically connected with step-down rectifier module I C2; Voltage stabilizing module IC3 pin 2 and capacitor C 6, C7 one end; The other end of Voltage stabilizing module IC3 pin 3 and capacitor C 4, C5, C6, C7 and connecing again is electrically connected with step-down rectifier module I C2.
5, digital control A.C. contactor according to claim 1, it is characterized in that: digital control circuit also includes digital control branch road and monostable circuit.
6, digital control A.C. contactor according to claim 5, it is characterized in that: digital control circuit also includes by LED 1, LED2 and high-low pressure indicating circuit in parallel again after resistance R 9, R10 connect, and the LED 2 of high-low pressure indicating circuit is connected with the negative pole of stabilized voltage power supply by triode BG1.
7, according to claim 5 or 6 described digital control A.C. contactors, it is characterized in that: digital control branch road includes NAND gate integrated circuit (IC) 4, filter circuit of pressure-stabilizing is electrically connected with door 1, the door 3 of NAND gate integrated circuit (IC) 4, and door 3 also is electrically connected with monostable circuit; Door 1 is connected on the adjustable resistance W1, and this adjustable resistance W1 series resistance R5 is connected with step-down rectifier module I C2 pin 2, and door 1 also connects with the circuit that the base stage of triode BG1 is connected with step-down rectifier module I C2 pin 2; The door 4 of NAND gate integrated circuit (IC) 4 is electrically connected with the high-low pressure indicating circuit, also is connected on the connecting circuit that is connected to door 1 and adjustable resistance W1 with resistance R 6, also is connected with door 1,2 line, and this line also is connected with the base stage of triode BG1; Door 2 be connected in adjustable resistance W2 and resistance R 7 be connected in series in 3 also with circuit that monostable circuit is electrically connected on.
8, according to claim 5 or 6 described digital control A.C. contactors, it is characterized in that: described monostable circuit also includes monostable flipflop IC5, monostable flipflop IC5 pin 3 is connected to and is connected to after the relay J on triode BG1 collector electrode and the circuit that Voltage stabilizing module IC3 pin 3 negative poles are connected, monostable flipflop IC5 pin 8, pin 4 are parallel to the resistance R 8 among the monostable flipflop IC5, the series circuit of electrochemical capacitor C8 after connecting, and monostable flipflop IC5 pin 2 is electrically connected with digital control branch road.
9, digital control A.C. contactor according to claim 1, it is characterized in that: digital control circuit includes analog digital time base module IC6, the pin 2 of analog digital time base module IC6, after connecting, pin 6 is connected on the adjustable resistance W, this adjustable resistance W connects with diode 2CW2 with capacitor C 11 parallel connections with resistance R 5 serial connection backs again and forms a branch road, this branch road one is terminated at step-down rectifier module I C2 pin 2 on the loop of pin 8 formation of diode D3 and analog digital time base module IC6, this loop resistance R 13 also in parallel and with the pin 14 of analog digital time base module IC6, pin 10, pin 4, the end that pin 13 is connected in series with resistance R 12, pin 5 links to each other with an end of capacitor C 14 serial connections, step-down rectifier module I C2 pin 3 is through the loop of capacitor C 15 with pin 12 formation of analog digital time base module IC6, also receive on the line of the pin 13 of time base module IC6 and resistance R 12 in this loop, this loop also with the pin 7 of analog digital time base module IC6, one end of pin 3 serial connection capacitor C 12, one end of pin 11 serial connection capacitor C 13, one end of the indicating circuit that pin 9 serial connection relay J reach and connect is connected.
10, according to claim 1 or 2 or 3 or 9 described digital control A.C. contactors, it is characterized in that: described filter circuit of pressure-stabilizing is capacitor C 10 circuit in parallel with diode 2CW1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01257952 CN2508383Y (en) | 2001-11-08 | 2001-11-08 | Numerically-controlled ac contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01257952 CN2508383Y (en) | 2001-11-08 | 2001-11-08 | Numerically-controlled ac contactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2508383Y true CN2508383Y (en) | 2002-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01257952 Expired - Fee Related CN2508383Y (en) | 2001-11-08 | 2001-11-08 | Numerically-controlled ac contactor |
Country Status (1)
| Country | Link |
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| CN (1) | CN2508383Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777595A (en) * | 2021-09-14 | 2021-12-10 | 天津理工大学 | Ultrasonic receiving circuit |
-
2001
- 2001-11-08 CN CN 01257952 patent/CN2508383Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777595A (en) * | 2021-09-14 | 2021-12-10 | 天津理工大学 | Ultrasonic receiving circuit |
| CN113777595B (en) * | 2021-09-14 | 2023-08-11 | 天津理工大学 | Ultrasonic wave receiving circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20020828 Termination date: 20091208 |