CN103311881A - Over-current protection device and method - Google Patents
Over-current protection device and method Download PDFInfo
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- CN103311881A CN103311881A CN2013102491338A CN201310249133A CN103311881A CN 103311881 A CN103311881 A CN 103311881A CN 2013102491338 A CN2013102491338 A CN 2013102491338A CN 201310249133 A CN201310249133 A CN 201310249133A CN 103311881 A CN103311881 A CN 103311881A
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Abstract
The invention discloses an over-current protection device and method. The over-current protection device comprises an input terminal, an output terminal, a rectifying circuit, a switch, a current detection circuit, a display device, a potential knob, a voltage comparator and a feedback control circuit. A user sets a protection current value through the potential knob, the over-current protection device displays a current current value instantly, and the current current value and the set value are compared. Once the current current value is larger than the set value, the circuit is disconnected immediately. By means of the device and method, the largest current intensity of an input device can be limited to provide necessary protection for the device and ensure safety of workers.
Description
Technical field
The present invention relates to the electrical maintenance field, relate in particular to a kind of overcurrent protective device and method.
Background technology
The maintenance that powers on of traditional device product directly is connected on the electrical network alternating current 220V or exchanges on the 380V and overhauls.If short circuit or other fault appear in equipment, input current sharply increases, and gently then causes input current end protection unit trip, and is heavy then cause equipment explosion, jeopardizes maintainer's safety.
Summary of the invention
Technical problem to be solved by this invention is the defective for background technology, and a kind of overcurrent protective device that can Limited Current intensity be no more than set point is provided.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Overcurrent protective device; comprise input terminal, lead-out terminal, rectification circuit, switch, current detection circuit, display device, current potential knob, voltage comparator and feedback control circuit; wherein input terminal, rectification circuit, switch, current detection circuit and lead-out terminal sequentially link to each other successively; current detection circuit also links to each other with voltage comparator, display device respectively; the current potential knob links to each other with voltage comparator, and feedback control circuit links to each other with voltage comparator, switch respectively.
A kind of overcurrent protection method based on above-mentioned overcurrent protective device, after the user set the current protection value by the current potential knob, its job step was as follows:
Step 1), the aanalogvoltage of current potential knob generation current protection value is passed to voltage comparator;
Step 2), rectification circuit changes into direct current with the alternating current of input terminal input;
Step 3), current detection circuit generate galvanic analog voltage signal and pass to respectively display device and voltage comparator, simultaneously direct current are passed to lead-out terminal through switch;
Step 4) shows current size of current after the display device receiver voltage analog signal;
Step 5), the aanalogvoltage of the more current direct current of voltage comparator and current protection value is big or small, and consequential signal is passed to feedback control circuit;
Step 6), feedback control circuit reception result signal, if current galvanic aanalogvoltage greater than the aanalogvoltage of current protection value, control switch open circuit then, otherwise control switch turning circuit then.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
Can limit the maximum current intensity of input equipment, provide necessary protection to equipment, guarantee staff's safety.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the circuit diagram of current detection circuit in the embodiment of the invention;
Fig. 3 is the circuit diagram of feedback control circuit in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in further detail:
As shown in Figure 1; the invention discloses a kind of overcurrent protective device; comprise input terminal, lead-out terminal, rectification circuit, switch, current detection circuit, display device, current potential knob, voltage comparator and feedback control circuit; wherein input terminal, rectification circuit, switch, current detection circuit and lead-out terminal sequentially link to each other successively; current detection circuit also links to each other with voltage comparator, display device respectively; the current potential knob links to each other with voltage comparator, and feedback control circuit links to each other with voltage comparator, switch respectively.
The embodiment current detection circuit adopts the current sensor ACS-712 of ALLEGRO company, and maximum can detect electric current 45A.
After the user set the current protection value by the current potential knob, its job step was as follows:
Step 1), the aanalogvoltage of current potential knob generation current protection value is passed to voltage comparator;
Step 2), rectification circuit changes into direct current with the alternating current of input terminal input;
Step 3), current detection circuit generate galvanic analog voltage signal and pass to respectively display device and voltage comparator, simultaneously direct current are passed to lead-out terminal through switch;
Step 4) shows current size of current after the display device receiver voltage analog signal;
Step 5), the aanalogvoltage of the more current direct current of voltage comparator and current protection value is big or small, and consequential signal is passed to feedback control circuit;
Step 6), feedback control circuit reception result signal, if current galvanic aanalogvoltage greater than the aanalogvoltage of current protection value, control switch open circuit then, otherwise control switch turning circuit then.
Fig. 2 is the circuit diagram of ACS-712, and its operation principle is as follows:
Electric current is by 1 pin and the input of 2 pin of ACS-712, and 3 pin and 4 pin are exported, and detection signal is by the output of 7 pin.When no current passed through, detection signal was 2.5V output, when having electric current to pass through, and the electric current of every increase 1A, detection signal increases 0.1V.
Fig. 3 is the circuit diagram of feedback control circuit, and its operation principle is as follows:
PRCA+ is two control signals that signal produces more afterwards, and K1 is switch, and VPP is the voltage after the rectification output, and circuit is by light-coupled isolation, with forceful electric power and weakness isolation.When switch closure, 1 pin of K1 and 3 pin conductings have Voltage-output.The voltage signal that produces when output current is during greater than the signal of set point, and PRCA+ is high level signal, and 1 pin and 3 pin disconnect, and circuit is Non voltage output.
Claims (2)
1. overcurrent protective device; it is characterized in that comprising input terminal, lead-out terminal, rectification circuit, switch, current detection circuit, display device, current potential knob, voltage comparator and feedback control circuit; wherein input terminal, rectification circuit, current detection circuit, switch and lead-out terminal sequentially link to each other successively; current detection circuit also links to each other with voltage comparator, display device respectively; the current potential knob links to each other with voltage comparator, and feedback control circuit links to each other with voltage comparator, switch respectively.
2. the overcurrent protection method based on overcurrent protective device claimed in claim 1 is characterized in that, after the user set the current protection value by the current potential knob, its job step was as follows:
Step 1), the aanalogvoltage of current potential knob generation current protection value is passed to voltage comparator;
Step 2), rectification circuit changes into direct current with the alternating current of input terminal input;
Step 3), current detection circuit generate galvanic analog voltage signal and pass to respectively display device and voltage comparator, simultaneously direct current are passed to lead-out terminal through switch;
Step 4) shows current size of current after the display device receiver voltage analog signal;
Step 5), the aanalogvoltage of the more current direct current of voltage comparator and current protection value is big or small, and consequential signal is passed to feedback control circuit;
Step 6), feedback control circuit reception result signal, if current galvanic aanalogvoltage greater than the aanalogvoltage of current protection value, control switch open circuit then, otherwise control switch turning circuit then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102491338A CN103311881A (en) | 2013-06-21 | 2013-06-21 | Over-current protection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102491338A CN103311881A (en) | 2013-06-21 | 2013-06-21 | Over-current protection device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103311881A true CN103311881A (en) | 2013-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102491338A Pending CN103311881A (en) | 2013-06-21 | 2013-06-21 | Over-current protection device and method |
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| CN (1) | CN103311881A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967571A (en) * | 2018-09-28 | 2020-04-07 | 施耐德电器工业公司 | Method for diagnosing tripping reason of electrical protection equipment, auxiliary equipment and electrical system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2318935A (en) * | 1996-10-23 | 1998-05-06 | Yazaki Corp | Power supply connection failure detector |
| CN2432713Y (en) * | 2000-05-01 | 2001-05-30 | 齐宇庆 | Non-fuse safety device |
| CN201054494Y (en) * | 2007-06-28 | 2008-04-30 | 东营市科瑞达工贸有限责任公司 | Transformer low-voltage power supply and protection integrated device |
| CN203326550U (en) * | 2013-06-21 | 2013-12-04 | 无锡商业职业技术学院 | Overcurrent protection device |
-
2013
- 2013-06-21 CN CN2013102491338A patent/CN103311881A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2318935A (en) * | 1996-10-23 | 1998-05-06 | Yazaki Corp | Power supply connection failure detector |
| CN2432713Y (en) * | 2000-05-01 | 2001-05-30 | 齐宇庆 | Non-fuse safety device |
| CN201054494Y (en) * | 2007-06-28 | 2008-04-30 | 东营市科瑞达工贸有限责任公司 | Transformer low-voltage power supply and protection integrated device |
| CN203326550U (en) * | 2013-06-21 | 2013-12-04 | 无锡商业职业技术学院 | Overcurrent protection device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967571A (en) * | 2018-09-28 | 2020-04-07 | 施耐德电器工业公司 | Method for diagnosing tripping reason of electrical protection equipment, auxiliary equipment and electrical system |
| CN110967571B (en) * | 2018-09-28 | 2024-03-26 | 施耐德电器工业公司 | Method for diagnosing the cause of tripping of an electrical protection device, auxiliary device and electrical system |
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Application publication date: 20130918 |