CN204089182U - Self-recoverage over-voltage over-current protection device - Google Patents
Self-recoverage over-voltage over-current protection device Download PDFInfo
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- CN204089182U CN204089182U CN201420361367.1U CN201420361367U CN204089182U CN 204089182 U CN204089182 U CN 204089182U CN 201420361367 U CN201420361367 U CN 201420361367U CN 204089182 U CN204089182 U CN 204089182U
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Abstract
A kind of self-recoverage over-voltage over-current protection device; be made up of voltage detecting and overvoltage signal output apparatus (1), current-limiting circuit (2), short switch (3); the input of voltage detecting and overvoltage signal output apparatus is connected between mains electricity input end and common port; current-limiting circuit is connected between mains electricity input end and civil power output; two outputs of short switch are connected in parallel between civil power output and common port; voltage detecting is connected with the control end of short switch with the output of overvoltage signal output apparatus, and common port is connected with civil power zero line.This device carries out effective overvoltage and overcurrent protection to load, and realizes self-recoverage, and circuit structure is simple, fast response time.
Description
Technical field
the present invention relates to electronic circuit field, particularly relate to the overvoltage of the load that electric main drives, current foldback circuit.
Background technology
power consumption equipment all has rated operational voltage scope, exceedes the rated operational voltage upper limit and runs the damage easily causing power consumption equipment.
the input of the power consumption equipment of incoming transport civil power is generally connected to fuse, is greater than rated value and after certain hour, fuse can fuse at the operating current of power consumption equipment, to reach the object of load overcurrent protection or short-circuit protection.
in actual applications, because of the reason of supply line or power supply unit, electric main there will be and exceedes a lot of and long-term situation of power consumption equipment rated operational voltage, at this moment the operating current increase of power consumption equipment is not a lot, when being less than or equal to fuse rated blowing-current, fuse needs long period fusing even can not fuse, and power consumption equipment long-play is easier to damage under this kind of state.
Utility model content
the technical problems to be solved in the utility model is to provide a kind of self-recoverage over-voltage over-current protection device.
solve this technical problem and adopt following technical scheme:
this self-recoverage over-voltage over-current protection device; be connected on civil power and with between electric loading; be made up of voltage detecting and overvoltage signal output apparatus, current-limiting circuit, short switch; the input of voltage detecting and overvoltage signal output apparatus is connected between mains electricity input end and common port; current-limiting circuit is connected between mains electricity input end and civil power output; two outputs of short switch are connected in parallel between civil power output and common port; voltage detecting is connected with the control end of short switch with the output of overvoltage signal output apparatus, and common port is connected with civil power zero line.
voltage detecting and overvoltage signal output apparatus are by series resistance R1, R2, storage capacitor C1, diac D1 forms, series resistance R1, R2 forms bleeder circuit, storage capacitor C1 is in parallel with resistance R2, a terminating resistor R1 of diac D1, the tie point of R2, the other end of diac D1 connects the control end G of short switch, current-limiting circuit is made up of PTC resistance R3, and short switch is made up of controllable silicon D2, and controllable silicon D2 the 2nd anode, the 1st anode are output, meet civil power output OUT and common port N respectively, the trigging control very G end of controllable silicon D2.
the beneficial effects of the utility model are: can carry out effective overvoltage and overcurrent protection to by electric loading, and have self-recovering function.The circuit structure of device impulse level that is simple, that export is stable, low in energy consumption, corresponding speed is fast.
Accompanying drawing explanation
fig. 1 is the electric structure frame chart of this device;
fig. 2 is the circuit diagram of this device embodiment 1.
fig. 3 is the circuit diagram of this device embodiment 2.
Embodiment
the utility model is also described in further detail (with reference to Fig. 1 Fig. 2 and Fig. 3) with reference to accompanying drawing below in conjunction with embodiment:
this device is connected on civil power and with between electric loading; it to the principle that mains supply over-voltage protection and load overcurrent are protected is; when voltage detecting and overvoltage signal output apparatus 1 detect the voltage occurring exceeding the power consumption equipment rated operational voltage upper limit; output level is to the control end G of short switch 3; short switch 3 rapidly short circuit, thus the situation avoiding that instant high-voltage appears in civil power output.
this device is also connected to current-limiting circuit 2, and when short switch 3 short circuit, current-limiting circuit 2 limits the maximum current flowing through civil power.
when the rated operational current or power consumption equipment that exceed current-limiting circuit 2 with the operating current of electric loading are short-circuited, current-limiting circuit 2 plays load overcurrent protection object.
in Fig. 1, IN is mains electricity input end, OUT civil power output, N are civil power common port, 1 be voltage detecting and signal output apparatus, 2 be current-limiting circuit, 3 be short switch.
in Fig. 2, voltage detecting and overvoltage signal output apparatus 1 are by series resistance R1, R2, storage capacitor C1, diac D1 is formed, series resistance R1, R2 forms bleeder circuit, storage capacitor C1 is in parallel with resistance R2, one end of diac D1 is connected on the connecting line of resistance R1 and R2, the other end of diac D1 connects the control end G of short switch 3, current-limiting circuit 2 is made up of PTC resistance R3, short switch 3 is made up of controllable silicon D2, controllable silicon D2 the 2nd anode, 1st anode is output, meet civil power output OUT and common port N respectively, the trigging control very G end of controllable silicon D2.
voltage detecting in Fig. 1 structured flowchart and overvoltage signal output apparatus 1, can use and form step-down bleeder circuit by transformer, triode or operational amplifier can also be used to form voltage detecting circuit and export or the output of control impuls level to control DC level.As shown in Figure 2, voltage detecting and overvoltage signal output apparatus 1 are by divider resistance R1, R2, and storage capacitor C1, diac D1 are formed for the utility model, have circuit simple, and debugging is convenient, does not need to provide working power in addition, export the advantage that impulse level is stable.
current-limiting circuit 2 in Fig. 1 structured flowchart can be made up of the thermistor of various positive temperature coefficient, and current-limiting circuit 2 of the present utility model is made up of PTC resistance.
because volume resistance is less under PTC resistance has normal temperature, it is little that running current flows through PTC resistance drop, PTC resistance heating under the effect of larger current, when arriving the transition temperature of PTC resistivity, the volume resistance of PTC resistance increases rapidly the characteristic presenting high-impedance state.
resistance also has after presenting high-impedance state, once flow through the maintenance electric current of electric current lower than PTC resistance of PTC resistance, the temperature of PTC resistance can decline, and the volume resistance of PTC can return to again the characteristic of less state gradually.
mains supply over-voltage is after short switch 3 short circuit; the PTC volume resistance of current-limiting circuit 2 limits the short circuit current flowing through civil power; avoid the rush of current to utility grid; after the PTC resistance heating of current-limiting circuit 2, volume resistance increases rapidly; the electric current flowing through short switch 3 also synchronously reduces, and this alleviates again the power consumption of protective circuit.
when being short-circuited more than PTC resistance rated operational current or power consumption equipment with the operating current of electric loading, the same fast heating of PTC resistance of current-limiting circuit 2, PTC volume resistance also increases rapidly, plays load overcurrent protection object.
after mains supply over-voltage or load overcurrent or load short circuits PTC resistance present high resistant, if line voltage recovers normal, voltage detecting and overvoltage signal output apparatus 1 stop exporting the control end G of impulse level to short switch 3, or after load overcurrent state disappears or load short circuits state disappears, the volume resistance of PTC resistance returns to less gradually, civil power power consumption equipment can normally work again, reaches self-healing object.
short switch 3 in Fig. 1 structured flowchart can be made up of relay, voltage detecting and overvoltage signal output apparatus 1 are when the voltage occurring exceeding the power consumption equipment rated operational voltage upper limit being detected, output level, to the control end G control relay adhesive of short switch 3, makes civil power export OUT and common port N short circuit after relay contact closure.
because relay line bag is energized to the time that the closing of contact needs mS level, when short switch 3 is made up of relay, voltage detecting and overvoltage signal output apparatus 1 are from overvoltage being detected and the adhesive of output level control relay, export to civil power and still have the time delay of more than mS with common port N short circuit, when causing civil power to occur overvoltage likely there is transient high voltage in load equipment side.
and the short switch 3 of this device is made up of controllable silicon, controllable silicon only needs the time of the electric current of mA level and nS level to get final product triggering and conducting, controllable silicon has the short time to tolerate, and overcurrent capability is strong, after triggering and conducting self-sustaining conducting until current over-zero or electric current oppositely just stop the feature of conducting, it is simple that the short switch 3 be made up of controllable silicon has circuit, trigger sensitivity is high, fast response time, effectively eliminates the possibility that transient high voltage appears in load equipment side.
for improving product to high-tension tolerance; the input of device can also increase a conventional power surge voltage protection circuit 4; Fig. 3 is the circuit diagram of embodiment 2; power surge voltage protection circuit 4 can be only made up of piezo-resistance R4; when there is Lightning Over-voltage; piezo-resistance absorbs a part of high voltage, can also increase inductance L 1, electric capacity C2 again, with inductance L1, electric capacity C2 to absorb the residual voltage of Lightning Over-voltage.
both can additional shell and line binding post by the circuit structure of Fig. 2, Fig. 3, make self-contained unit, also can without stand-alone shell, the modular form as a kind of circuit is connected on the transformer end of incoming cables of instrument, instrument or equipment, carries out over-voltage over-current protection.
Claims (2)
1. a self-recoverage over-voltage over-current protection device, by voltage detecting and overvoltage signal output apparatus (1), current-limiting circuit (2), short switch (3) forms, it is characterized in that the input of voltage detecting and overvoltage signal output apparatus (1) is connected between mains electricity input end (IN) and common port (N), current-limiting circuit (2) is connected between mains electricity input end (IN) and civil power output (OUT), two outputs of short switch (3) are connected in parallel between civil power output (OUT) and common port (N), voltage detecting is connected with the control end (G) of short switch (3) with the output of overvoltage signal output apparatus (1), common port (N) is connected with civil power zero line.
2. self-recoverage over-voltage over-current protection device according to claim 1, it is characterized in that voltage detecting and overvoltage signal output apparatus (1) are by series resistance R1, R2, storage capacitor C1, diac D1 forms, series resistance R1, R2 forms bleeder circuit, storage capacitor C1 is in parallel with resistance R2, the one terminating resistor R1 of diac D1, on the connecting line of R2, the other end of diac D1 connects the control end G of short switch (3), current-limiting circuit (2) is made up of PTC resistance R3, short switch (3) is made up of controllable silicon D2, controllable silicon D2 the 2nd anode, 1st anode is output, connect civil power output (OUT) and common port (N) respectively, the trigging control very G end of controllable silicon D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420361367.1U CN204089182U (en) | 2014-07-01 | 2014-07-01 | Self-recoverage over-voltage over-current protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420361367.1U CN204089182U (en) | 2014-07-01 | 2014-07-01 | Self-recoverage over-voltage over-current protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204089182U true CN204089182U (en) | 2015-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420361367.1U Expired - Fee Related CN204089182U (en) | 2014-07-01 | 2014-07-01 | Self-recoverage over-voltage over-current protection device |
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| Country | Link |
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| CN (1) | CN204089182U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810782A (en) * | 2015-05-06 | 2015-07-29 | 青岛歌尔声学科技有限公司 | Power circuit based on resettable fuse and electronic product |
-
2014
- 2014-07-01 CN CN201420361367.1U patent/CN204089182U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810782A (en) * | 2015-05-06 | 2015-07-29 | 青岛歌尔声学科技有限公司 | Power circuit based on resettable fuse and electronic product |
| CN104810782B (en) * | 2015-05-06 | 2019-01-25 | 青岛歌尔声学科技有限公司 | Power circuit and electronic product based on self-recovery fuse |
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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 |
Granted publication date: 20150107 Termination date: 20180701 |
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| CF01 | Termination of patent right due to non-payment of annual fee |