CN203734545U - Power supply device with output over-current protection, short-circuit protection, and automatic recovery functions - Google Patents
Power supply device with output over-current protection, short-circuit protection, and automatic recovery functions Download PDFInfo
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- CN203734545U CN203734545U CN201420090189.3U CN201420090189U CN203734545U CN 203734545 U CN203734545 U CN 203734545U CN 201420090189 U CN201420090189 U CN 201420090189U CN 203734545 U CN203734545 U CN 203734545U
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Abstract
The utility model, which belongs to the field of an electronic power supply device, provides a power supply device with output over-current protection, short-circuit protection, and automatic recovery functions. The provided power supply device comprises a power supply transformer T1, a sampling transformer T2, a relay K1, a power supply control circuit and a protective tube circuit; and the power supply control circuit is connected between an output terminal P point and the power supply transformer T1. When the current outputted by the power supply device does not exceed a set maximum output current, the normally-closed contact of the relay K1 switch provides power for the output terminal; when the current outputted by the power supply device exceeds a set maximum output current, the power supply control circuit is started and thus the relay K1 is disconnected, and the power supply output terminal is disconnected with a load, so that the automatic protection effect is realized; and after the protection finishes, the relay K1 resets and continuously provides power for the output terminal. Therefore, the power supply control circuit constantly detects whether the output current exceeds the set maximum output current and determines whether the automatic protection is started.
Description
Technical field
The present invention relates to a kind of charger, be specifically related to a kind of charger with output overcurrent protection, short-circuit protection, auto restore facility.
Background technology
In cable TV network engineering; charger is widely used in cable TV network; for fear of burning out supply transformer and other circuit devcies because of load short circuits or overcurrent; tend at charger input, output serial connection fuse; in the time of load short circuits or overcurrent; cause blown fuse; thereby protection supply transformer and other circuit devcies; this mode has obvious shortcoming; after fuse is fused; must be from new replacing fuse, just can make charger restore electricity, this brings very large trouble to TV network engineering maintenance.
Utility model content
The purpose of this utility model, for addressing the above problem, provides a kind of charger with output overcurrent protection, short-circuit protection, auto restore facility, and this charger has advantages of that circuit is simple, reliable and stable, can greatly reduce maintenance cost.
For achieving the above object, the utility model provides a kind of charger with output overcurrent protection, short-circuit protection, auto restore facility, comprises supply transformer T1, sampling transformer T2, relay K 1, power-supplying circuit and protective tube circuit;
The two ends of the armature winding of described supply transformer T1 are connected with protective tube F1, F2 respectively, and after the other end access 220V AC civil power of protective tube F1, F2, secondary winding is transformed into two groups and exchanges output 60V, 18V; The 0V terminal of described supply transformer T1 secondary winding output is connected with ground; The 60V terminal of described supply transformer T1 secondary winding output is connected with armature winding one end of sampling transformer T2;
Described power-supplying circuit is connected between output P point and supply transformer T1, described power-supplying circuit is connected with the 18V terminal of supply transformer T1, secondary winding one end of sampling transformer T2, one end of the armature winding of described sampling transformer T2 is connected with relay K 1, and the other end of described sampling transformer T2 secondary winding is connected with ground.
The switch of described relay K 1 is single-pole double-throw switch (SPDT), and terminal 1 and the terminal 2 of described relay K 1 switch are normally closed contact point, the second terminal output 60V AC supply power voltage of described relay K 1 switch; Described relay K 1 switch also comprises the 3rd terminal, the 4th terminal, Five-terminals.
Described power-supplying circuit comprises rectifier diode D1, D2, reverse protection diode D3, D4, capacitor C 1, C2, C3, C4, C5, power regulator U1, adjustable potentiometer R1, resistance R 2, R3, switch triode Q1 and 555 timer U2;
The anodal supply transformer T1 that connects of described rectifier diode D1 exchanges output 18V terminal, described rectifier diode D1 negative pole is connected with the positive pole of capacitor C 1, the first terminal of power regulator U1, the second terminal of described power regulator U1 is connected with ground, the 3rd terminal of described power regulator U1 is connected with one end of the positive pole of capacitor C 2, resistance R 2, R3, the 4th pin of 555 timer U2, the octal of 555 timer U2, and the negative pole of described capacitor C 2 is connected with ground;
The positive pole of described rectifier diode D2 is connected with the another terminal of the secondary winding of sampling transformer T2, negative pole is connected with the positive pole of capacitor C 3, one end of adjustable potentiometer R1, the negative pole of described capacitor C 3 is connected with ground, the other end of described adjustable potentiometer R1 is connected with ground, adjustable potentiometer center terminal is connected with the base stage of switch triode Q1, the emitter of described switch triode Q1 is connected with ground, and collector electrode is connected with the other end of resistance R 2, the crus secunda of 555 timer U2;
The first pin of described 555 timer U2 is connected with ground, tripod is connected with the positive pole of diode D3, the 5th pin is connected with one end of capacitor C 4, the 6th pin, the 7th pin parallel connection are connected with the positive pole of capacitor C 5, the other end of resistance R 3, the other end of described capacitor C 4 is connected with ground, described capacitor C 5 is in parallel with resistance R 3, the negative pole of described capacitor C 5 is connected with ground, the negative pole of described diode D3 is connected with 4 pin of diode D4 negative pole, relay K 1, the coils from parallel connection of coils of described diode D4 and relay K 1, the positive pole of diode D4,5 pin of relay K 1 are connected with ground;
The utlity model has following beneficial effect: in the utility model, detect by output overcurrent is set; the charger of short-circuit protection and auto restore facility; both can avoid burning out supply transformer and other electronic devices because of load short circuits or overcurrent, more ground energy reduce maintenance cost.
Brief description of the drawings
In order to be illustrated more clearly in the utility model example or technical scheme of the prior art, to needed accompanying drawing in embodiment or description of the Prior Art be done simply and be introduced below, obviously, accompanying drawing in the following describes is only examples more of the present utility model, for those of ordinary skill in the art, do not paying under creationary prerequisite, can also obtain according to these accompanying drawings other accompanying drawing
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model example, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Referring to Fig. 1, the utility model provides a kind of charger with output overcurrent protection, short-circuit protection, auto restore facility, comprises supply transformer T1, sampling transformer T2, relay K 1, power-supplying circuit and protective tube circuit;
The two ends of the armature winding of described supply transformer T1 are connected with protective tube F1, F2 respectively, and after the other end access 220V AC civil power of protective tube F1, F2, secondary winding is transformed into two groups and exchanges output 60V, 18V; The 0V terminal of described supply transformer T1 secondary winding output is connected with ground; The 60V terminal of described supply transformer T1 secondary winding output is connected with armature winding one end of sampling transformer T2;
Described power-supplying circuit is connected between output P point and supply transformer T1, described power-supplying circuit is connected with the 18V terminal of supply transformer T1, secondary winding one end of sampling transformer T2, one end of the armature winding of described sampling transformer T2 is connected with relay K 1, and the other end of described sampling transformer T2 secondary winding is connected with ground.
Referring to Fig. 2, as the utility model one embodiment, described relay unit 100 is single-pole double-throw switch (SPDT), and the first terminal of relay 100 and the second terminal are normally closed contact point, described relay 100 second terminals are connected with P point, and described P point is output 60V AC power supply terminal; Described relay 100 switches also comprise the 3rd terminal, the 4th terminal, Five-terminals;
Referring to Fig. 2, as the utility model one embodiment, described power-supplying circuit unit 101 comprises rectifier diode D1, D2, reverse protection diode D3, D4, capacitor C 1, C2, C3, C4, C5, power regulator U1, adjustable potentiometer R1, resistance R 2, R3, switch triode Q1, and 555 timer U2;
Concrete, the anodal supply transformer T1 that connects of described rectifier diode D1 exchanges output 18V terminal, described rectifier diode D1 negative pole is connected with the positive pole of capacitor C 1, the first terminal (Vin) of power regulator U1, the second terminal (GND) of described power regulator U1 is connected with ground, the 3rd terminal (Vout) of described power regulator U1 is connected with one end of the positive pole of capacitor C 2, resistance R 2, R3, the 4th pin of 555 timer U2, the octal of 555 timer U2, and the negative pole of described capacitor C 2 is connected with ground;
Further, the positive pole of described rectifier diode D2 is connected with the another terminal of the secondary winding of sampling transformer T2, negative pole is connected with the positive pole of capacitor C 3, one end of adjustable potentiometer R1, the negative pole of described capacitor C 3 is connected with ground, the other end of described adjustable potentiometer R1 is connected with ground, adjustable potentiometer center terminal is connected with the base stage of switch triode Q1, and the emitter of described switch triode Q1 is connected with ground, and collector electrode is connected with the other end of resistance R 2, the crus secunda of 555 timer U2;
Further, the first pin of described 555 timer U2 is connected with ground, tripod is connected with the positive pole of diode D3, the 5th pin is connected with one end of capacitor C 4, the 6th pin, the positive pole of the 7th pin parallel connection and capacitor C 5, the other end of resistance R 3 connects, the other end of described capacitor C 4 is connected with ground, described capacitor C 5 is in parallel with resistance R 3, the negative pole of described capacitor C 5 is connected with ground, the negative pole of described diode D3 and diode D4 negative pole, 4 pin of relay K 1 connect, the coils from parallel connection of coils of described diode D4 and relay K 1, the positive pole of diode D4, 5 pin of relay K 1 are connected with ground,
In conjunction with operation principle, power-supplying circuit 101 is described further, in the time that charger output current exceedes the maximum output stream setting, sampling transformer T2 output voltage is through rectifier diode D2, adjustable potentiometer R1, the base stage that makes switch triode Q1 is high level, switch triode Q1 conducting, now, the crus secunda of 555 timer U2 is low level, tripod is exported high level, the direct current of output is through diode D3, the coil of relay K 1, make relay adhesive, now, the first terminal of relay K 1 and the 3rd terminal closure, normally closed contact point the first terminal and second terminal of relay K 1 are disconnected, charger output and load disconnect, meanwhile, direct current charges to capacitor C 5 by resistance R 3, in the time that the voltage of C5 is elevated to the required trigger voltage of 6 pin of 555 timer U2, 555 timers are triggered and restart, now, 3 pin of 555 timer U2 are set to low level, relay K 1 resets, charger continues to power to output.After relay 100 resets, if the electric current of charger output output still exceedes the maximum output current setting, normally closed contact point the first terminal and second terminal of relay K 1 are still disconnected, and disconnect output power supply, reenter guard mode; If the electric current of charger output output does not exceed the maximum output current setting, relay K 1 resets, and charger continues output power supply.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (3)
1. a charger with output overcurrent protection, short-circuit protection, auto restore facility, is characterized in that: comprise supply transformer T1, sampling transformer T2, relay K 1, power-supplying circuit and protective tube circuit;
The two ends of the armature winding of described supply transformer T1 are connected with protective tube F1, F2 respectively, and after the other end access 220V AC civil power of protective tube F1, F2, secondary winding is transformed into two groups and exchanges output 60V, 18V; The 0V terminal of described supply transformer T1 secondary winding output is connected with ground; The 60V terminal of described supply transformer T1 secondary winding output is connected with armature winding one end of sampling transformer T2;
Described power-supplying circuit is connected between output P point and supply transformer T1, described power-supplying circuit is connected with the 18V terminal of supply transformer T1, secondary winding one end of sampling transformer T2, one end of the armature winding of described sampling transformer T2 is connected with relay K 1, and the other end is connected with ground.
2. a kind of charger with output overcurrent protection, short-circuit protection, auto restore facility as claimed in claim 1, the switch of described relay K 1 is single-pole double-throw switch (SPDT), terminal 1 and the terminal 2 of described relay K 1 switch are normally closed contact point, the second terminal output 60V AC supply power voltage of described relay K 1 switch; Described relay K 1 switch also comprises the 3rd terminal, the 4th terminal, Five-terminals.
3. a kind of charger with output overcurrent protection, short-circuit protection, auto restore facility as claimed in claim 1, it is characterized in that: described power-supplying circuit comprises rectifier diode D1, D2, reverse protection diode D3, D4, capacitor C 1, C2, C3, C4, C5, power regulator U1, adjustable potentiometer R1, resistance R 2, R3, switch triode Q1 and 555 timer U2;
The anodal supply transformer T1 that connects of described rectifier diode D1 exchanges output 18V terminal, described rectifier diode D1 negative pole is connected with the positive pole of capacitor C 1, the first terminal of power regulator U1, the second terminal of described power regulator U1 is connected with ground, the 3rd terminal of described power regulator U1 is connected with one end of the positive pole of capacitor C 2, resistance R 2, R3, the 4th pin of 555 timer U2, the octal of 555 timer U2, and the negative pole of described capacitor C 2 is connected with ground;
The positive pole of described rectifier diode D2 is connected with the another terminal of the secondary winding of sampling transformer T2, negative pole is connected with the positive pole of capacitor C 3, one end of adjustable potentiometer R1, the negative pole of described capacitor C 3 is connected with ground, the other end of described adjustable potentiometer R1 is connected with ground, adjustable potentiometer center terminal is connected with the base stage of switch triode Q1, the emitter of described switch triode Q1 is connected with ground, and collector electrode is connected with the other end of resistance R 2, the crus secunda of 555 timer U2;
The first pin of described 555 timer U2 is connected with ground, tripod is connected with the positive pole of diode D3, the 5th pin is connected with one end of capacitor C 4, the 6th pin, the 7th pin parallel connection are connected with the positive pole of capacitor C 5, the other end of resistance R 3, the other end of described capacitor C 4 is connected with ground, described capacitor C 5 is in parallel with resistance R 3, the negative pole of described capacitor C 5 is connected with ground, the negative pole of described diode D3 is connected with 4 pin of diode D4 negative pole, relay K 1, the coils from parallel connection of coils of described diode D4 and relay K 1, the positive pole of diode D4,5 pin of relay K 1 are connected with ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420090189.3U CN203734545U (en) | 2014-02-28 | 2014-02-28 | Power supply device with output over-current protection, short-circuit protection, and automatic recovery functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420090189.3U CN203734545U (en) | 2014-02-28 | 2014-02-28 | Power supply device with output over-current protection, short-circuit protection, and automatic recovery functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203734545U true CN203734545U (en) | 2014-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420090189.3U Expired - Fee Related CN203734545U (en) | 2014-02-28 | 2014-02-28 | Power supply device with output over-current protection, short-circuit protection, and automatic recovery functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203734545U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226602A (en) * | 2015-10-26 | 2016-01-06 | 成都辰来科技有限公司 | A kind of supply module avoiding surge current to disturb for fpga chip |
| CN105245108A (en) * | 2015-10-26 | 2016-01-13 | 成都辰来科技有限公司 | Power supply circuit used for FPGA chip to prevent surge current interference |
| CN110954237A (en) * | 2019-11-22 | 2020-04-03 | 奇瑞汽车股份有限公司 | Engine coolant temperature sensor and vehicle |
| CN112531639A (en) * | 2020-11-12 | 2021-03-19 | 深圳Tcl数字技术有限公司 | Overcurrent protection trigger circuit and device |
-
2014
- 2014-02-28 CN CN201420090189.3U patent/CN203734545U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226602A (en) * | 2015-10-26 | 2016-01-06 | 成都辰来科技有限公司 | A kind of supply module avoiding surge current to disturb for fpga chip |
| CN105245108A (en) * | 2015-10-26 | 2016-01-13 | 成都辰来科技有限公司 | Power supply circuit used for FPGA chip to prevent surge current interference |
| CN110954237A (en) * | 2019-11-22 | 2020-04-03 | 奇瑞汽车股份有限公司 | Engine coolant temperature sensor and vehicle |
| CN110954237B (en) * | 2019-11-22 | 2021-11-30 | 奇瑞汽车股份有限公司 | Engine coolant temperature sensor and vehicle |
| CN112531639A (en) * | 2020-11-12 | 2021-03-19 | 深圳Tcl数字技术有限公司 | Overcurrent protection trigger circuit and device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20170228 |
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| CF01 | Termination of patent right due to non-payment of annual fee |