CN203481784U - Protection apparatus for output short circuit of DC (direct-current) power supply - Google Patents
Protection apparatus for output short circuit of DC (direct-current) power supply Download PDFInfo
- Publication number
- CN203481784U CN203481784U CN201320622156.4U CN201320622156U CN203481784U CN 203481784 U CN203481784 U CN 203481784U CN 201320622156 U CN201320622156 U CN 201320622156U CN 203481784 U CN203481784 U CN 203481784U
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- power supply
- short circuit
- output
- protection apparatus
- resistance
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- Direct Current Feeding And Distribution (AREA)
Abstract
Provided is a protection apparatus for output short circuits of a DC (direct-current) power supply. The protection apparatus is composed of a relay circuit, a starting holding circuit and a fuse resistor. The protection apparatus is disposed behind the DC power supply to prevent short circuits during the output of the DC power supply or to protect the DC power supply when a short circuit happens to an electrical appliance, and thus the protection apparatus prevents accidents caused by short circuits, is rapid in cutting off the power, and effectively prevents the influence on a front-stage power supply by a back-end short circuit. When the short circuit is relieved, the protection apparatus starts to switch on the output again. Further, when the protection apparatus is connected to the DC power supply, the output cannot be started and switched on when the positive electrodes and the negative electrodes are connected in a reverse manner. The protection apparatus is simple in circuit and is safe, reliable, convenient and practical.
Description
Technical field:
The utility model relates to field of electric control, produces the protective circuit of short circuit during a kind of DC power supply output.
Background technology:
When people use external direct current power supply, often because of short circuit short circuit, damage power supply and electrical appliance, even lead to a disaster.
Summary of the invention:
The utility model object; while using external direct current power supply electrical equipment for people; often because of short circuit; damage DC power supply, for this reason, provide a kind of circuit simple and reliable a kind of DC source output short circuit protective device; be placed in DC power output end; prevent the short circuit of DC power supply output short circuit, or during electrical appliance short circuit, work the DC power supply effect of protecting.
A DC source output short circuit protective device, by relay circuit, starts holding circuit, and insurance resistance forms.
After this device is placed in DC power supply, DC power anode to DC power anode output, connects DC load through resistance R 1, relay J 1 normally opened contact JK1; DC power anode is through resistance R 1, diode D1, relay J 1 coil, and the resistance R 3 connecing, capacitor C 2, connect triode Q1 collector electrode, triode Q1 emitter connects DC power cathode, the base stage of triode Q1, is closed button AN2 and capacitor C 1 and connects to DC power cathode through capacitor C 1, and the base stage of triode Q1 is after resistance R 2, voltage-stabiliser tube VD1, one tunnel is through starting button AN1, diode D1, resistance R 1 to DC power anode, another road through light-emitting diode TD1 to DC power anode output.
This device course of work:
After DC power supply energising, connect this device, press startup button AN1, DC power supply is through resistance R 1, diode D1, start button AN1, voltage-stabiliser tube VD1, after resistance R 2, then through capacitor C 1 buffering, the base stage of triode Q1 obtains electric, triode Q1 conducting, and relay J 1 normally opened contact adhesive, output is connected; DC power supply is through cathode output end, light-emitting diode TD1, and voltage-stabiliser tube VD1, resistance R 2, to the base stage power supply of triode Q1, maintains the base potential of triode Q1, after startup, keeps output to connect.
DC load is worked after switching on power; DC load short circuit when access; or when DC power anode output and the short circuit of DC power cathode short circuit, direct voltage moment is fallen, voltage-stabiliser tube VD1 cut-off; triode Q1 cut-off; and simultaneously, direct voltage moment is fallen, relay J 1 decompression and discharging; thereby output is cut off, protection DC power supply.Resistance R 1 plays buffering and the effect of insurance resistance.AN2 is for closing button.After short circuit is removed, restart and connect output.If during this device access DC power supply, both positive and negative polarity connects instead, because of diode D1 unilateral conduction, cannot start and connect output.
Beneficial effect: DC source output short circuit protective device, prevent the short circuit of DC power supply output short circuit, or during electrical appliance short circuit, protection DC power supply, prevents the accident that produced by short circuit, cut-off velocity is fast, effectively prevents the impact of rear terminal shortcircuit on front level power supply.After short circuit is removed, restart and connect output.And when access DC power supply, both positive and negative polarity connects instead, cannot start and connect output.Circuit is simple, safe and reliable, convenient and practical.
Accompanying drawing explanation:
Fig. 1 is the utility model pie graph.Fig. 2 is the utility model circuit diagram, and Fig. 3 is that Fig. 2 simplifies rear circuit diagram.
In Fig. 2, Fig. 3, (1) relay circuit, (2) starts holding circuit, (3) current-limiting resistance.
Embodiment:
DC source output short circuit protective device, is characterized in that, as shown in Figure 1, Figure 2, Figure 3 shows: by relay circuit, start holding circuit, insurance resistance forms.According to voltage and power requirement, selective relay J1, JK1 is relay J 1 normally opened contact switch, Q1 is NPN type triode, C1-2 is electrochemical capacitor, and light-emitting diode TD1 makes indicator light, and VD1 is voltage-stabiliser tube, AN1 is for starting button, AN2 is for closing button, and R1-3 is resistance, and resistance R 1 need to be selected according to power, value 0.1-4 Ω, the task performance that can not affect electrical appliance is advisable.Fig. 3 is Fig. 2 simplified electrical circuit diagram, and circuit is more succinct.
After DC power supply energising, connect this device, press startup button AN1, DC power supply is through resistance R 1, diode D1, start button AN1, voltage-stabiliser tube VD1, after resistance R 2, then through capacitor C 1 buffering, the base stage of triode Q1 obtains electric, triode Q1 conducting, and relay J 1 normally opened contact adhesive, output is connected; DC power supply is through cathode output end, light-emitting diode TD1, and voltage-stabiliser tube VD1, resistance R 2, to the base stage power supply of triode Q1, maintains the base potential of triode Q1, after startup, keeps output to connect.
DC load is worked after switching on power; DC load short circuit when access; or when DC power anode output and the short circuit of DC power cathode short circuit, direct voltage moment is fallen, voltage-stabiliser tube VD1 cut-off; triode Q1 cut-off; and simultaneously, direct voltage moment is fallen, relay J 1 decompression and discharging; thereby output is cut off, protection DC power supply.Resistance R 1 plays buffering and the effect of insurance resistance.AN2 is for closing button.After short circuit is removed, restart and connect output.If during this device access DC power supply, both positive and negative polarity connects instead, because of diode D1 unilateral conduction, cannot start and connect output.
A DC source output short circuit protective device, prevents the short circuit of DC power supply output short circuit, or during electrical appliance short circuit, and protection DC power supply prevents from the accident that produced by short circuit from effectively preventing the impact of rear terminal shortcircuit on front level power supply.After short circuit is removed, restart and connect output.And when access DC power supply, both positive and negative polarity connects instead, cannot start and connect output.Circuit is simple, safe and reliable, convenient and practical, easily promotes.
Claims (1)
1. a DC source output short circuit protective device, by relay circuit, starts holding circuit, and insurance resistance forms; After this device is placed in DC power supply, DC power anode to DC power anode output, connects DC load through resistance R 1, relay J 1 normally opened contact JK1; DC power anode is through resistance R 1, diode D1, relay J 1 coil, and the resistance R 3 connecing, capacitor C 2, connect triode Q1 collector electrode, triode Q1 emitter connects DC power cathode, the base stage of triode Q1, is closed button AN2 and capacitor C 1 and connects to DC power cathode through capacitor C 1, and the base stage of triode Q1 is after resistance R 2, voltage-stabiliser tube VD1, one tunnel is through starting button AN1, diode D1, resistance R 1 to DC power anode, another road through light-emitting diode TD1 to DC power anode output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320622156.4U CN203481784U (en) | 2013-10-09 | 2013-10-09 | Protection apparatus for output short circuit of DC (direct-current) power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320622156.4U CN203481784U (en) | 2013-10-09 | 2013-10-09 | Protection apparatus for output short circuit of DC (direct-current) power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203481784U true CN203481784U (en) | 2014-03-12 |
Family
ID=50230039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320622156.4U Withdrawn - After Issue CN203481784U (en) | 2013-10-09 | 2013-10-09 | Protection apparatus for output short circuit of DC (direct-current) power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203481784U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490375A (en) * | 2013-10-09 | 2014-01-01 | 兰如根 | Output short circuit protection device for direct-current power supply |
-
2013
- 2013-10-09 CN CN201320622156.4U patent/CN203481784U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490375A (en) * | 2013-10-09 | 2014-01-01 | 兰如根 | Output short circuit protection device for direct-current power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20180710 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20180710 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |