CN2314504Y - Short circuit protector - Google Patents
Short circuit protector Download PDFInfo
- Publication number
- CN2314504Y CN2314504Y CN 97244458 CN97244458U CN2314504Y CN 2314504 Y CN2314504 Y CN 2314504Y CN 97244458 CN97244458 CN 97244458 CN 97244458 U CN97244458 U CN 97244458U CN 2314504 Y CN2314504 Y CN 2314504Y
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- CN
- China
- Prior art keywords
- circuit
- input
- output
- current
- coupling
- 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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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to an automatic opening emergency circuit protection device. A control circuit is arranged in a shell. An indication lamp, a recovery button and an output socket are arranged on the shell. The control circuit is provided with a current limiting circuit, a switching circuit, a triggering recovery circuit, a voltage dropping rectification circuit and a coupling circuit, wherein, an output end of the current limiting circuit is respectively connected with input ends of the switching circuit and the triggering recovery circuit; an output end of the switching circuit is respectively connected with an input end of the voltage dropping rectification circuit and the output socket; an output end of the triggering recovery circuit is respectively connected with the input end of the voltage dropping rectification circuit and the output socket; an output end of the voltage dropping rectification circuit is respectively connected with an input end of the coupling circuit and the output socket; an output end of the coupling circuit is connected with the switching circuit. The utility model is a short circuit protector with rapid reaction.
Description
The utility model relates to a kind of automatic disconnection emergency protective circuit device that the undesirable variation that departs from the normal electrical working condition is directly reacted.
Owing to reasons such as overcurrent, overvoltage, the phase failure, electric leakage cause circuit to depart from the normal electrical working condition is recurrent, existing for this reason various protective circuit devices.The CN2199626Y patent disclosure a kind of low voltage electric network multifunctional protection device, its adopts one by transistor BG
1And relay J
1And the Control Network of electromagnetic switch CJ composition, at transistor BG
1Positive bias circuit supply network in connect a thyristor T
1, T
1The control utmost point through two diodes respectively with phase failure signal acquisition circuit and electric leakage signal gather amplifying circuit link constitute.The CN2199628Y patent disclosure a kind of electronic voltage controller short-circuit protection, be used for the electronic vehicle voltage regulator, it by detect, first instruction, second instruction and executive circuit constitute.The CN2200246Y patent disclosure a kind of electronic security(ELSEC) protection automatic controller, it is made up of induction by current parts, electric current limiting part, overvoltage or low-voltage device etc.When electricity consumption overburden or short circuit, cut off the power supply automatically, after removing, recover power supply automatically.The CN2200247Y patent disclosure a kind of tracking mode electronic insurance device; it comprises electronic switching circuit, open loop amplifying circuit, linear amplifier circuit, overload protecting circuit, short-circuit protection circuit and signal recognition circuit, and electronic switching circuit is connected in the AC load loop.
The purpose of this utility model is to provide a kind of button to recover the contactless fast short-circuit protective device of formula.
The utility model comprises housing, input power cord and plug, power output socket, control circuit, indicator light, wherein control circuit is provided with current-limiting circuit, switching circuit, trigger restore circuit, step-down rectifying circuit and coupling circuit, the input termination input power cord of current-limiting circuit, the output of current-limiting circuit connects switching circuit respectively and triggers the input of restore circuit, the output of switching circuit connects the input and the power output socket of step-down rectifying circuit respectively, the output that triggers restore circuit connects the input and the power output socket of step-down rectifying circuit respectively, the output of step-down rectifying circuit connects the input and the power output socket of coupling circuit respectively, the output termination switching circuit of coupling circuit.The recovery button of power output socket and indicator light and triggering restore circuit is installed on the housing.
Said switching circuit can adopt the SCR control circuit, triggers restore circuit and adopts button, and current-limiting circuit adopts current-limiting resistance, and step-down rectifying circuit adopts the series circuit of resistance-capacitance depressurization circuit and diode bridge rectifier circuit, and coupling circuit adopts optical coupler.
In electronic product production and maintenance process; scruff; the reversal connection of band polar component; the power supply major loop short circuit that the puncture of bad components and parts etc. causes often takes place; if such electric equipment products are directly connect city's electrical testing; must the safety of the person, power supply and electric equipment products be threatened, and the protection of common fusing fuse is extremely non-remunerative on operating efficiency and economic benefit, especially in process of production.Obviously the utility model has advantages such as safety, facility, saving in production process and maintenance.To by civil power (100～230V) power supplies, energising the instantaneous large-current duration be not more than 5ms small-power electrical equipment (＜200W), all can join by the utility model and civil power, realization is to the short-circuit protection of this electrical equipment.If short circuit appears in the power supply major loop, it can be at 7～17ms internal cutting off power supply.
Fig. 1 is a control circuit block diagram of the present utility model.
Fig. 2 is a control circuit schematic diagram of the present utility model.
As shown in Figure 1, the civil power input power cord connects the input of current-limiting circuit (1), the output of current-limiting circuit (1) connects switching circuit (2) respectively and triggers the input of restore circuit (3), the output one tunnel of switching circuit (2) and triggering restore circuit (3) connects the input of step-down rectifying circuit (4), another road connects power output socket (6), and the output of step-down rectifying circuit (4) connects the input and the power output socket (6) of coupling circuit (5) respectively.
As shown in Figure 2, current-limiting circuit adopts current-limiting resistance R
1, R
2, switching circuit adopts SCR control circuit, bidirectional triode thyristor D
1Anode meet current-limiting resistance R
2, R
6, C
2Form controllable silicon trigger electrode protective circuit, R
5Be controllable silicon D
1The triggering current-limiting resistance, D
1Negative electrode and C
2An end connect by recovery button K
1With capacitor C
1The triggering restore circuit that is composed in series, and be connected with power output socket.Step-down rectifying circuit is by R
7, C
3And diode bridge rectifier circuit (D
3～D
6) form C
3Be decompression capacitor, R
7Be discharge resistance, when commercial power supply is 110V, can connect K switch
2, at this moment decompression capacitor is by C
3Become C
3With C
4In parallel.An end and the C that triggers restore circuit that step-down rectifying circuit is elementary
1And controllable silicon D
1Negative electrode connect, the other end is connected with the civil power input power cord, the input of the output termination coupling circuit of step-down rectifying circuit, coupling circuit is by optical coupler (MOC), R
8, C
5And light emitting diode lamp (D
2) form, when working properly, D
2Bright, when breaking down, D
2Go out, when resuming work again, D
2Bright again.The triggering current-limiting resistance R of the output termination switching circuit of coupling circuit
5, R
6
When circuit is in short circuit, be short-circuited when for example supply voltage is in crest, this moment, the output of short-circuit protector power supply was forced to zero, but the C among Fig. 2
5Restrained full electric charge by τ=RC discharge.Because its discharging current still can be kept optical coupler MOC gate current greater than 5mA after being voltage zero-cross behind the τ discharge time 1, so after the zero passage, the secondary still conducting of optical coupler MOC, controllable silicon D
1Also will continue half cycle of conducting.Enter next cycle, promptly behind 3 τ, the MOC gate current can't make secondary conducting, then D less than 5mA
1Because of no longer conducting of triggerless, so far, short circuit is cut off behind generation 15ms.
When removing short circuit load, when pressing recovery button, power supply passes through C
1, C
3(or C
3, C
4) provide gate current to MOC greater than 5mA, make its secondary conducting, and triggering and conducting D
1And D
1After the conducting, make C
5Charge to and to keep D
1Behind voltage zero-cross, still can oppositely be triggered, make short-circuit protector that normal power supply output be arranged.
Claims (4)
1. short-circuit protector, comprise housing, input power cord and plug, power output socket, control circuit and indicator light, control circuit is located in the housing, power output socket and indicator light are located on the housing, it is characterized in that said control circuit is provided with current-limiting circuit, triggers restore circuit, step-down rectifying circuit and coupling circuit; The input termination input power cord of current-limiting circuit, output connect switching circuit respectively and trigger the input of restore circuit; The output of switching circuit connects the input and the power output socket of step-down rectifying circuit respectively; The output that triggers restore circuit connects the input of power output socket and step-down rectifying circuit respectively; The output of step-down rectifying circuit connects the input and the power output socket of coupling circuit respectively, the output termination switching circuit of coupling circuit.
2. short-circuit protector as claimed in claim 1 is characterized in that said current-limiting circuit adopts current-limiting resistance R
1, R
2, switching circuit adopts SCR control circuit, bidirectional triode thyristor D
1Anode meet current-limiting resistance R
2, R
6With C
2Form controllable silicon D
1The trigger electrode protective circuit, R
5For triggering current-limiting resistance.
3. as claim 1,2 described short-circuit protectors is characterized in that triggering restore circuit by recovery button K
1And capacitor C
1Be composed in series, and with bidirectional triode thyristor D
1Negative electrode and C
2An end connect, step-down rectifying circuit is by capacitance-resistance R
7, C
3Reduction voltage circuit and diode bridge rectifier circuit (D
3～D
6) be composed in series, the elementary termination of step-down rectifying circuit triggers the C of restore circuit
1With controllable silicon D
1Negative electrode connect, the other end is connected with the civil power input power cord, the input of the output termination coupling circuit of step-down rectifying circuit.
4. short-circuit protector as claimed in claim 1 is characterized in that said coupling circuit is by optical coupler (MOC), R
8, C
5And light emitting diode lamp D
2Form the triggering current-limiting resistance R of the output termination switching circuit of coupling circuit
5, R
6
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97244458 CN2314504Y (en) | 1997-08-01 | 1997-08-01 | Short circuit protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97244458 CN2314504Y (en) | 1997-08-01 | 1997-08-01 | Short circuit protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2314504Y true CN2314504Y (en) | 1999-04-14 |
Family
ID=33953170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97244458 Expired - Fee Related CN2314504Y (en) | 1997-08-01 | 1997-08-01 | Short circuit protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2314504Y (en) |
-
1997
- 1997-08-01 CN CN 97244458 patent/CN2314504Y/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 | ||
| 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 |