CN203387156U - Circuit protection device - Google Patents
Circuit protection device Download PDFInfo
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- CN203387156U CN203387156U CN201320432062.0U CN201320432062U CN203387156U CN 203387156 U CN203387156 U CN 203387156U CN 201320432062 U CN201320432062 U CN 201320432062U CN 203387156 U CN203387156 U CN 203387156U
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- comparator
- potentiometer
- circuit
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Abstract
The utility model relates to a circuit protection device. Secondary-side voltage of a current transformer sampling circuit is rectified and filtered, and then is connected to a sliding voltage adjusting point of a first potentiometer RP1; a sliding voltage-dividing point of a second potentiometer RP2 is connected to an antiphase end of a first comparator U1A, an antiphase end of a third comparator U1C and a fixed end of a third potentiometer RP4 respectively; after being connected in parallel with a positive pole end of an electrolytic capacitor C7, an adjustable end of the third potentiometer RP4 is connected to an antiphase end of a second comparator U1B; the output voltage VCC of power supply voltage is connected to an in-phase end of the third comparator U1C through a voltage-dividing point of a fourth potentiometer RP3; output voltage VCC of a power supply circuit is grounded through a current limiting resistor R12 and a diode D6; and the positive end of the diode D6 is connected with a same-phase end of the first comparator U1A and a same-phase end of the second comparator U1B. The circuit protection device of the utility model is advantageous in simple circuit structure, and simple and orderly production debugging procedures, and can greatly improve production efficiency.
Description
Technical field
The utility model relates to a kind of line protector.
Background technology
Line protector is a kind of mains side that is serially connected with AC power, while the fault state such as overload, short circuit occurring in AC power line, can disconnect in time the electric protective device of the power supply of power consumption equipment.Variation due to the load characteristic of power consumption equipment; it is instantaneous that power consumption equipment starts; the temporal variations of AC power should belong to the tolerable scope; therefore; tend to add and put the overload delay adjustment circuit before the overload output circuit, thereby to avoid occurring that unnecessary protection guarantees the normal startup of power consumption equipment.Existing line protector, because the logical order design of circuit is numerous and diverse, a plurality of parameters comprise that the order of adjusting of overload current, overload delay time and short circuit current is reasonable not, make the production commissioning staff very difficult.
Summary of the invention
The purpose of this utility model is to overcome the defect of prior art; provide a kind of by current transformer sample circuit output overloading circuit and the short circuit circuit of adjusting of adjusting respectively; and overload is adjusted before circuit to add and is put the overload delay adjustment circuit, is convenient to produce the line protector of debugging.
For achieving the above object, the utility model adopts a kind of like this line protector, described line protector comprises overload indicating circuit, the short circuit output circuit, overload delay adjustment circuit and overload output circuit, the current transformer sample circuit is from the mains side power taking that exchanges power supply, described overload indicating circuit comprises the first potentiometer RP1, the second potentiometer RP2 and the first comparator U1A, described overload delay adjustment circuit comprises the 3rd potentiometer RP4, described overload output circuit comprises the second comparator U1B, described short circuit output circuit comprises the 4th potentiometer RP3 and the 3rd comparator U1C, the secondary side voltage of described current transformer sample circuit is through rectification, filtering is connected to the slip pressure regulation point of described the first potentiometer RP1, the slip dividing point of described the second potentiometer RP2 is connected to respectively the end of oppisite phase of the first comparator U1A, the stiff end of the end of oppisite phase of the 3rd comparator U1C and described the 3rd potentiometer RP4, the adjustable end of described the 3rd potentiometer RP4 and the positive terminal of electrochemical capacitor C7 and connect after be connected to the end of oppisite phase of described the second comparator U1B, the output voltage V CC of supply voltage is connected to the in-phase end of described the 3rd comparator U1C through the dividing point of described the 4th potentiometer RP3, the output voltage V CC of described power circuit is through the first current-limiting resistance R12, diode D6 is connected to ground, the positive terminal of described diode D6 is connected to respectively the in-phase end of described the first comparator U1A and the in-phase end of described the second comparator U1B.Compared with the prior art; the beneficial effects of the utility model are embodied in: by the first potentiometer, realize that the action protection operating current is adjustable in certain scope; and by the second potentiometer overload current threshold value of adjusting; when the action of overload indicating circuit; carry out the 3rd potentiometer again and transship adjusting of delay time, finally carrying out the 4th potentiometer is adjusting of short circuit current threshold value, and product circuit is simple in structure; produce the debugging rules simple in order, can greatly enhance productivity.
Especially, described line protector also comprises optocoupler driving isolation circuit and silicon controlled control circuit, described silicon controlled control circuit comprises controllable silicon Q1, described optocoupler driving isolation circuit comprises optocoupler U2, the output of the output of described the second comparator U1B and described the 3rd comparator U1C and connect after be connected to the negative electrode input of described optocoupler U2, the collector output of described optocoupler U2 is connected to the base stage of triode, the collector electrode of described triode is connected to the trigger end of described controllable silicon Q1, the two ends of described controllable silicon Q1 are serially connected with the DC loop of rectifier bridge BG1, the interchange of described rectifier bridge BG1 is connected to one of them phase line of described AC power, another phase line of described AC power is through reset button S1, the coil of relay J 1 is connected to another interchange end of described rectifier bridge BG1.Adopt controllable silicon to carry out the action of control relay, controllable silicon, once triggering, no longer is subject to the impact of triggering signal; can realize the locking of overcurrent, short-circuit protection; now, should thoroughly disconnect the silicon controlled path by reset button, can restart the defencive function of line protector.
Especially, the coil two ends of described relay J 1 also connect working state indicating circuit, and described working state indicating circuit comprises the second current-limiting resistance R14 and the working station indicator LED2 of series connection.By the coil two ends at relay and connect working state indicating circuit, but the direct viewing line conditions.
The accompanying drawing explanation
Fig. 1 is the functional-block diagram of the utility model embodiment line protector;
Fig. 2 is the schematic diagram of overload indicating circuit in the utility model embodiment line protector, short circuit output circuit, overload delay adjustment circuit and overload output circuit;
Fig. 3 is the schematic diagram of optocoupler driving isolation circuit, silicon controlled control circuit and working state indicating circuit in the utility model embodiment line protector.
Embodiment
As shown in Figures 1 to 3, a kind of line protector, line protector comprises overload indicating circuit, the short circuit output circuit, overload delay adjustment circuit and overload output circuit, the current transformer sample circuit is from the mains side power taking that exchanges power supply, overload indicating circuit comprises the first potentiometer RP1, the second potentiometer RP2 and the first comparator U1A, the overload delay adjustment circuit comprises the 3rd potentiometer RP4, the overload output circuit comprises the second comparator U1B, the short circuit output circuit comprises the 4th potentiometer RP3 and the 3rd comparator U1C, the secondary side voltage of current transformer sample circuit is through rectification, filtering is connected to the slip pressure regulation point of the first potentiometer RP1, the slip dividing point of the second potentiometer RP2 is connected to respectively the end of oppisite phase of the first comparator U1A, the stiff end of the end of oppisite phase of the 3rd comparator U1C and the 3rd potentiometer RP4, the adjustable end of the 3rd potentiometer RP4 and the positive terminal of electrochemical capacitor C7 and connect after be connected to the end of oppisite phase of the second comparator U1B, the output voltage V CC of supply voltage is connected to the in-phase end of the 3rd comparator U1C through the dividing point of the 4th potentiometer RP3, the output voltage V CC of power circuit is through the first current-limiting resistance R12, diode D6 is connected to ground, the positive terminal of diode D6 is connected to respectively the in-phase end of the first comparator U1A and the in-phase end of the second comparator U1B.
Line protector also comprises optocoupler driving isolation circuit and silicon controlled control circuit, silicon controlled control circuit comprises controllable silicon Q1, optocoupler driving isolation circuit comprises optocoupler U2, the output of the output of the second comparator U1B and the 3rd comparator U1C and connect after be connected to the negative electrode input of optocoupler U2, the collector output of optocoupler U2 is connected to the base stage of triode, the collector electrode of triode is connected to the trigger end of controllable silicon Q1, the two ends of controllable silicon Q1 are serially connected with the DC loop of rectifier bridge BG1, the interchange of rectifier bridge BG1 is connected to one of them phase line of AC power, another phase line of AC power is through reset button S1, the coil of relay J 1 is connected to another interchange end of rectifier bridge BG1.
The coil two ends of relay J 1 also connect working state indicating circuit, and working state indicating circuit comprises the second current-limiting resistance R14 and the working station indicator LED2 of series connection.
Claims (3)
1. a line protector, it is characterized in that: described line protector comprises overload indicating circuit, the short circuit output circuit, overload delay adjustment circuit and overload output circuit, the current transformer sample circuit is from the mains side power taking that exchanges power supply, described overload indicating circuit comprises the first potentiometer (RP1), the second potentiometer (RP2) and the first comparator (U1A), described overload delay adjustment circuit comprises the 3rd potentiometer (RP4), described overload output circuit comprises the second comparator (U1B), described short circuit output circuit comprises the 4th potentiometer (RP3) and the 3rd comparator (U1C), the secondary side voltage of described current transformer sample circuit is through rectification, filtering is connected to the slip pressure regulation point of described the first potentiometer (RP1), the slip dividing point of described the second potentiometer (RP2) is connected to respectively the end of oppisite phase of the first comparator (U1A), the stiff end of the end of oppisite phase of the 3rd comparator (U1C) and described the 3rd potentiometer (RP4), the positive terminal of the adjustable end of described the 3rd potentiometer (RP4) and electrochemical capacitor (C7) and connect after be connected to the end of oppisite phase of described the second comparator (U1B), the output voltage of supply voltage (VCC) is connected to the in-phase end of described the 3rd comparator (U1C) through the dividing point of described the 4th potentiometer (RP3), the output voltage of described power circuit (VCC) is through the first current-limiting resistance (R12), diode (D6) is connected to ground, the positive terminal of described diode (D6) is connected to respectively the in-phase end of described the first comparator (U1A) and the in-phase end of described the second comparator (U1B).
2. line protector according to claim 1, it is characterized in that: described line protector also comprises optocoupler driving isolation circuit and silicon controlled control circuit, described silicon controlled control circuit comprises controllable silicon (Q1), described optocoupler driving isolation circuit comprises optocoupler (U2), the output of the output of described the second comparator (U1B) and described the 3rd comparator (U1C) and connect after be connected to the negative electrode input of described optocoupler (U2), the collector output of described optocoupler (U2) is connected to the base stage of triode, the collector electrode of described triode is connected to the trigger end of described controllable silicon (Q1), the two ends of described controllable silicon (Q1) are serially connected with the DC loop of rectifier bridge (BG1), an interchange of described rectifier bridge (BG1) is connected to one of them phase line of described AC power, another phase line of described AC power is through reset button (S1), the coil of relay (J1) is connected to another interchange end of described rectifier bridge (BG1).
3. line protector according to claim 2; it is characterized in that: the coil two ends of described relay (J1) also connect working state indicating circuit, and described working state indicating circuit comprises the second current-limiting resistance (R14) and the working station indicator (LED2) of series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320432062.0U CN203387156U (en) | 2013-07-07 | 2013-07-07 | Circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320432062.0U CN203387156U (en) | 2013-07-07 | 2013-07-07 | Circuit protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203387156U true CN203387156U (en) | 2014-01-08 |
Family
ID=49875606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320432062.0U Expired - Fee Related CN203387156U (en) | 2013-07-07 | 2013-07-07 | Circuit protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203387156U (en) |
-
2013
- 2013-07-07 CN CN201320432062.0U patent/CN203387156U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140108 Termination date: 20190707 |