CN2237296Y - Overcurrent protector for radar aerial control system - Google Patents
Overcurrent protector for radar aerial control system Download PDFInfo
- Publication number
- CN2237296Y CN2237296Y CN 95214511 CN95214511U CN2237296Y CN 2237296 Y CN2237296 Y CN 2237296Y CN 95214511 CN95214511 CN 95214511 CN 95214511 U CN95214511 U CN 95214511U CN 2237296 Y CN2237296 Y CN 2237296Y
- Authority
- CN
- China
- Prior art keywords
- direct current
- circuit
- pin
- current amplifier
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to an over current protector for a radar aerial control system, which comprises a bidirectional voltage comparing circuit and an executive circuit and also comprises a current sensing circuit which is formed by the connection of a current sensing module LA25-NP and a sampling resistor Rm and a direct current amplifying filter which is formed by the connection of a direct current amplifier, a filter and an over current threshold regulator. Compared with an inductive type over current protector and an over current breaking protector, the utility model has the advantages of quick reaction time, strong overload capacity, safe work, simple operation, good stability, good temperature characteristic, etc. The utility model can be widely popularized and used for radar aerial systems and other electric facilities.
Description
The utility model belongs to can finish automatic switchover when undesirable variation of normal running conditions occurring departing from; be exclusively used in specific type of electric machine electricity emergency protective circuit device technique field equipment or that be exclusively used in cable or line system sectionalised protection, relate to specifically and be used for motor and prevent overload.
Present overcurrent protector used in electric equipment; a kind of is the induction type overcurrent protector; the mode of employing choking-winding or series resistance is measured the electric current in this Equipment Control loop; reach the protection purpose through the circuitry cuts of amplifying, will import this equipment by control circuit, executive circuit; this protector, reaction speed is slow, influences the rapidity of whole system; volume is big, is not suitable for directly being assemblied in the printed board.Another protector is the overcurrent breaker protector, and this overcurrent protector response time lags, and sensitivity is low, even causes that electric equipment because of overcurrent is burnt out, does not have protective effect.
The purpose of this utility model is to overcome the shortcoming of overcurrent protector in the above-mentioned electric equipment, for radar antenna control system provides that fast, overload capacity of a kind of reaction time is strong, good reliability, volume are little, stability and the good overcurrent protector of temperature characterisitic.
For achieving the above object, the solution that the utility model adopts is: it includes bi-directional voltage comparison circuit, executive circuit, and it also comprises current sense circuit and direct current amplifier filter.Current sense circuit is used for the current signal that responsive radar antenna drives the servomotor input circuit, and providing voltage signal to the direct current amplifier filter, the input of this circuit is connected with the input that radar antenna drives servomotor, the R of output and direct current amplifier filter
3With filter C
1An end connect.The direct current amplifier filter is to be connected and composed by direct current amplifier, filter, overcurrent thresholding adjuster, is used for the voltage signal of current sense circuit input is amplified and elimination pulsation spike filter C
1An end and the R of direct current amplifier
3An end connect, and pass through R
3Be connected filter C with inverting input 2 pin of direct current amplifier arithmetic unit PM156
1Other end ground connection, overcurrent thresholding adjuster W
1The R of an end by direct current amplifier
4Be connected with inverting input 2 pin of direct current amplifier arithmetic unit PM156, the other end is connected with the output of direct current amplifier with adjustable end.The forward voltage comparison circuit voltage comparator N of the output of direct current amplifier filter and bi-directional voltage comparison circuit
1Inverting input 3 pin of-LM111 and reverse voltage comparison circuit voltage comparator N
2In-phase input end 2 pin of-LM111 connect, and the bi-directional voltage comparison circuit compares the positive-negative polarity voltage of direct current amplifier filter.The output of bi-directional voltage comparison circuit is connected with an end of executive circuit relay J coil, and another termination dc power anode of relay J coil, the normally opened contact of relay J drive the servomotor control circuit with radar antenna and be connected.
Current sense circuit of the present utility model is to be connected and composed by current sensor module LA25-NP and sample resistance Rm.The 1-5 pin of current sensor module LA25-NP is connected with the input that radar antenna drives servomotor with the 6-10 pin, output M pin is connected the other end ground connection of sample resistance Rm with the end of sample resistance Rm.
The utility model is compared with the overcurrent breaker protector with the induction type overcurrent protector; has fast, advantage such as overload capacity is strong, safe and reliable, simple to operate, stability and temperature characterisitic are good of reaction time; can be used for radar antenna control system, also can on other electric equipment, extensively promote the use of.
Fig. 1 is an electrical principle block diagram of the present utility model.
Fig. 2 is the electrical schematic diagram of an embodiment of the utility model.
Below in conjunction with drawings and Examples the utility model is further described.
In Fig. 1; current sense circuit is by the electric current of responsive radar antenna drive motors input circuit; measuring radar antenna drives the servomotor torque value and provides voltage signal to the direct current amplifier filter; voltage signal is amplified and elimination pulsation spike through the direct current amplifier filter; be input to the bi-directional voltage comparator, the positive-negative polarity voltage of importing is compared, drive executive circuit work; disconnect radar antenna servomotor control circuit, radar antenna control system is realized overcurrent protection.
In Fig. 2, the current sense circuit of present embodiment is to be connected and composed by current sensor module LA25-NP and sample resistance Rm, the input 1-5 pin of current sensor module LA25-NP is connected with DC power supply with input series connection, the power end of radar antenna servomotor with the 6-10 pin, output M pin is connected the other end ground connection of sample resistance Rm with the end of sample resistance Rm.Current sensor module LA25-NP is used for the electric current that responsive radar antenna drives the servomotor input circuit, the size of electric current is directly proportional with the torque that radar antenna drives servomotor, obtain being proportional to the voltage of input circuit electric current on sample resistance Rm, the voltage swing at sample resistance Rm two ends will provide radar antenna accordingly and drive the servomotor level of torque.
The direct current amplifier filter of present embodiment is by direct current amplifier, filter C
1, overcurrent thresholding adjuster W
1Connect and compose.Direct current amplifier is by operational amplifier PM156 and peripheral element R
2, R
3, R
4, C
2, C
3, C
4, C
5Connect and compose, in-phase input end 3 pin of operational amplifier PM156 pass through R
2Ground connection, inverting input 2 pin and R
3And R
4An end connect and pass through R
3Be connected, compensate end 1 pin and 8 pin and C with the end of current sense circuit sample resistance Rm
3Two ends connect, power end 4 pin and 7 pin connect DC power supply, C
2The positive pole and ground of two termination DC power supply between, C
4Two termination dc power cathodes and ground between, C
5Two termination operational amplifier PM156 inverting input 2 pin and output 6 pin between.Filter C
1A termination direct current amplifier R
3The other end and an end, the other end ground connection of current sense circuit sample resistance Rm.Overcurrent thresholding adjuster W
1An end and direct current amplifier R
4The other end connect and pass through R
4Be connected with inverting input 2 pin of direct current amplifier operational amplifier PM156, the other end is connected with output 6 pin of direct current amplifier operational amplifier PM156 with adjustable end.The direct current amplifier filter amplifies the voltage signal at current sense circuit sample resistance Rm two ends; and elimination pulsation spike; prevent that overcurrent thresholding adjuster is adjusted radar antenna control system overcurrent threshold range because the transient peak of electric current causes protective circuit to cause the mistake protection.
The bi-directional voltage comparison circuit of present embodiment is by forward voltage comparison circuit, reverse voltage comparison circuit and R
6Connect and compose.The forward voltage comparison circuit is by voltage comparator N
1-LM111 and peripheral element R
5, C
6, C
8, C
9Connect and compose voltage comparator N
1In-phase input end 2 pin and the R of-LM111
5And C
6An end connect R
3Another termination dc power anode, C
6The other end and voltage comparator N
1Anti-phase input 3 pin of-LM111 meet the output of direct current amplifier filter, voltage comparator N
1The compensation of-LM111 holds that 5 pin and 6 pin are connected to each other, power end 4 pin and 8 pin connect DC power supply, hold 1 pin ground connection, C
8Two termination dc power anodes and ground between, C
9Two termination dc power cathodes and ground between.The reverse voltage comparison circuit is by voltage comparator N
2-LM111 and peripheral element R
7, C
7, C
10, C
11Connect and compose voltage comparator N
2In-phase input end 2 pin of-LM111 meet output, inverting input 3 pin and the R of direct current amplifier filter
7And C
7An end connect R
7Another termination dc power cathode, C
7The other end and voltage comparator N
2In-phase input end 2 pin of-LM111 meet the output of direct current amplifier filter, voltage comparator N
2The compensation of-LM111 holds that 5 pin are connected to each other with 6 pin, power end 8 pin are connected with DC power supply with 4 pin, hold 1 pin ground connection, output 7 pin and forward voltage comparison circuit voltage comparator N
1Output 7 pin of-LM111 connect, C
10Two termination dc power anodes and ground between, C
11Two termination dc power cathodes and ground between.R
6A termination forward voltage comparison circuit voltage comparator N
1In-phase input end 2 pin of-LM111, another termination reverse voltage comparison circuit voltage comparator N
2Inverting input 3 pin of-LM111.The bi-directional voltage comparison circuit compares the positive-negative polarity voltage amplification signal of direct current amplifier filter output, when the absolute value of voltage surpasses the deboost value, and voltage comparator N
1-LM111 or voltage comparator N
2The operating state of-LM111 is converted to output low level by the output high level.
The executive circuit of present embodiment is a relay J, and an end of relay J coil is connected with the output of bi-directional voltage comparison circuit, another termination dc power anode, and the normally opened contact of relay J is connected with the control circuit that radar antenna drives servomotor.The DC power supply of present embodiment is selected 15V for use.When the loading moment of radar antenna driving servomotor surpassed limit value, the Control current that radar antenna drives servomotor did not reach the shutter limit value, voltage comparator N
1-LM111 or voltage comparator N
2-LM111 exports high level, and the normally opened contact of executive circuit relay J disconnects, and radar antenna drives servomotor and continues rotation; When the loading moment of radar antenna driving servomotor surpassed limit value, the Control current of radar antenna servomotor reached the shutter limit value, voltage comparator N
1-LM111 or voltage comparator N
2-LM111 is converted to output low level by the output high level, and the normally opened contact of executive circuit relay J is cut off radar antenna and drives the servo control system circuit by adhesive, and radar antenna drives servomotor and stops the rotation, and reaches the protection purpose.
Claims (2)
1, a kind of radar antenna control system overcurrent protector, it includes bi-directional voltage comparison circuit, executive circuit, it is characterized in that: it also includes current sense circuit and direct current amplifier filter;
Described current sense circuit is: the input that its input and radar antenna drive servomotor is connected, the R of output and direct current amplifier filter
3With filter C
1An end connect, this circuit is used for the current signal that responsive radar antenna drives the servomotor input circuit, and provides voltage signal to the direct current amplifier filter;
Described direct current amplifier filter is to be connected and composed by direct current amplifier, filter, overcurrent thresholding adjuster, is used for the voltage signal of current sense circuit input is amplified and elimination pulsation spike filter C
1An end and direct current amplifier R
3An end connect, and pass through R
3Be connected filter C with inverting input 2 pin of direct current amplifier arithmetic unit PM156
1Other end ground connection, overcurrent thresholding adjuster W
1The R of an end by direct current amplifier
4Be connected with inverting input 2 pin of direct current amplifier arithmetic unit PM156, the other end is connected with the output of direct current amplifier with adjustable end;
The forward voltage comparison circuit voltage comparator N of the output of direct current amplifier filter and bi-directional voltage comparison circuit
1Inverting input 3 pin of-LM111 and reverse voltage comparison circuit voltage comparator N
2In-phase input end 2 pin of-LM111 connect, positive-negative polarity voltage to the direct current amplifier filter compares, one end of the output termination executive circuit relay J coil of bi-directional voltage comparison circuit, another termination dc power anode of relay J coil, the normally opened contact of relay J drive the servomotor control circuit with radar antenna and are connected.
2, according to the described radar antenna control system overcurrent protector of claim 1; it is characterized in that said current sense circuit is: the 1-5 pin of current sensor module LA25-NP is connected with the input that radar antenna drives servomotor with the 6-10 pin, output M pin is connected the other end ground connection of sample resistance Rm with the end of sample resistance Rm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95214511 CN2237296Y (en) | 1995-06-07 | 1995-06-07 | Overcurrent protector for radar aerial control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95214511 CN2237296Y (en) | 1995-06-07 | 1995-06-07 | Overcurrent protector for radar aerial control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2237296Y true CN2237296Y (en) | 1996-10-09 |
Family
ID=33864117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95214511 Expired - Fee Related CN2237296Y (en) | 1995-06-07 | 1995-06-07 | Overcurrent protector for radar aerial control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2237296Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100341219C (en) * | 2001-09-28 | 2007-10-03 | 易通公司 | Method and device for detecting and inhibiting parallel arc fault |
| CN107255763A (en) * | 2017-07-28 | 2017-10-17 | 南京工业职业技术学院 | A kind of antenna lodging device automatic testing equipment |
-
1995
- 1995-06-07 CN CN 95214511 patent/CN2237296Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100341219C (en) * | 2001-09-28 | 2007-10-03 | 易通公司 | Method and device for detecting and inhibiting parallel arc fault |
| CN107255763A (en) * | 2017-07-28 | 2017-10-17 | 南京工业职业技术学院 | A kind of antenna lodging device automatic testing equipment |
| CN107255763B (en) * | 2017-07-28 | 2019-07-02 | 南京工业职业技术学院 | A kind of antenna lodging device automatic testing equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |