CN206422959U - A kind of safety protective circuit - Google Patents
A kind of safety protective circuit Download PDFInfo
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- CN206422959U CN206422959U CN201621434933.2U CN201621434933U CN206422959U CN 206422959 U CN206422959 U CN 206422959U CN 201621434933 U CN201621434933 U CN 201621434933U CN 206422959 U CN206422959 U CN 206422959U
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- mos pipe
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- voltage mos
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Abstract
The utility model is related to a kind of safety protective circuit, including fuse F1, bridge rectifier chip BR1, high-voltage MOS pipe Q1, photoelectrical coupler U1, voltage-regulator diode Z1 and the output end U0 being sequentially connected；When output end U0 outputs are normal, high-voltage MOS pipe Q1 is in cut-off state；When the output end U0 output open circuits, high-voltage MOS pipe Q1 closure conductings, moment produces high current fuse wire F1, makes input and the mains isolation of circuit；Safety protective circuit of the present utility model makes circuit input and mains isolation when circuit output is opened a way, and more stablizes safe and reliable, and circuit structure is simple, and cost is low.
Description
Technical field
The utility model is related to a kind of safety protective circuit.
Background technology
During for traditional instruction class lamp circuit output open circuit, circuit input Reng Yu city's electrical connections, it is difficult to accomplish isolation,
Circuit is in working condition in itself, it is impossible to which, to extraneous correct indication signal, this is likely to result in serious lives and properties
Loss.Therefore, it is necessary to when circuit output is opened a way, allow circuit to input and mains isolation.
Utility model content
In order to overcome circuit input in the prior art and civil power to be difficult to the technical problem isolated, the utility model provides a kind of
Safety protective circuit, solve because circuit input and civil power be difficult to isolate and caused by safety risks.
To achieve the above object, the utility model is adopted the following technical scheme that：
A kind of safety protective circuit, including be sequentially connected fuse F1, bridge rectifier chip BR1, high-voltage MOS pipe Q1,
Photoelectrical coupler U1, voltage-regulator diode Z1 and output end U0；
When output end U0 outputs are normal, high-voltage MOS pipe Q1 is in cut-off state；When output end U0 outputs are opened
Lu Shi, high-voltage MOS pipe Q1 closure conducting, moment produce high current fuse wire F1, make input and the mains isolation of circuit.
Further, the safety protective circuit also includes resistance R1, resistance R2, resistance R3 and power supply pin VOUT；
No. 2 pins of the bridge rectifier chip BR1 are connected with the zero line AC-N of civil power, and No. 3 pins pass through fuse
F1 is connected to the phase line AC-L of civil power, and No. 1 pin is connected with high-voltage MOS pipe Q1 drain D, and No. 4 pins are connected to height simultaneously
Metal-oxide-semiconductor Q1 source class S and ground, high-voltage MOS pipe Q1 grid level G is pressed to be connected to ground by resistance R2；
The photoelectrical coupler U1 includes phototriode Q2 and light emitting diode D1；The current collection of the phototriode Q2
Pole c is connected by resistance R1 with power supply pin VOUT, and emitter e is connected to ground by resistance R2, the light emitting diode D1's
Anode is connected with voltage-regulator diode Z1 anode, and voltage-regulator diode Z1 negative electrode is connected to the positive pole of output end, light emitting diode
D1 negative electrode is connected to the negative pole of output end by resistance R3.
Preferably, the fuse F1 is the rated current slow fusing type fuse smaller than high-voltage MOS pipe Q1.
Preferably, the high-voltage MOS pipe Q1 is the high-voltage MOS pipe of the rated current TO-220 encapsulation bigger than fuse F1.
The beneficial effects of the utility model at least include it is following some：
Safety protective circuit of the present utility model makes circuit input and mains isolation when driving output open circuit, for indicating
The light fixture of class more stablizes safe and reliable when being indicated to outer signals, and circuit structure is simple, and cost is low.
Brief description of the drawings
Fig. 1 is a kind of circuit theory diagrams of safety protective circuit of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further：
As shown in figure 1, a kind of safety protective circuit includes the fuse F1, bridge rectifier chip BR1, high pressure being connected in series
Metal-oxide-semiconductor Q1, photoelectrical coupler U1, voltage-regulator diode Z1, resistance R1, resistance R2, resistance R3, power supply pin VOUT and output end
U0；Bridge rectifier chip BR1 No. 2 pins are connected with the zero line AC-N of civil power, and No. 3 pins are connected to city by fuse F1
The phase line AC-L of electricity, No. 1 pin is connected with high-voltage MOS pipe Q1 drain D, and No. 4 pins are connected to high-voltage MOS pipe Q1's simultaneously
Source class S and ground, high-voltage MOS pipe Q1 grid level G are connected to ground by resistance R2；Photoelectrical coupler U1 include phototriode Q2 and
Light emitting diode D1；Phototriode Q2 colelctor electrode c is connected by resistance R1 with power supply pin VOUT, and emitter e passes through electricity
Resistance R2 is connected to ground, and light emitting diode D1 anode is connected with voltage-regulator diode Z1 anode, and voltage-regulator diode Z1 negative electrode connects
The positive pole of output end is connected to, light emitting diode D1 negative electrode is connected to the negative pole of output end by resistance R3.
The safety protective circuit course of work is as follows：When output end U0 exports normal work, voltage-regulator diode Z1 is not up to
The breakdown reverse voltage of itself and in cut-off state, light emitting diode D1 cut-offs, photoelectrical coupler U1 disconnects, phototriode
Q2 is also switched off, and high-voltage MOS pipe Q1 grid level G moves zero potential to by resistance R2, and high-voltage MOS pipe Q1 is in cut-off state；Work as output
When holding U0 output open circuits, because output end U0 voltage is flown up, voltage-regulator diode is punctured when reaching breakdown reverse voltage
Z1, now photoelectrical coupler U1 close, light emitting diode D1 conductings, phototriode Q2 is also switched on, powered by power supply pin VOUT,
So that high-voltage MOS pipe Q1 grid level G voltages rise, high-voltage MOS pipe Q1 closure conductings, moment produces high current fuse wire
F1, makes input and the mains isolation of circuit.
Intrinsic safety full protection circuit has open circuit protecting function, and device used is few, and cost is low；In addition, fuse F1 is volume
Determine the electric current slow fusing type fuse smaller than high-voltage MOS pipe Q1, high-voltage MOS pipe Q1 is the rated current TO-220 bigger than fuse F1
The high-voltage MOS pipe of encapsulation, to ensure that fuse F1 first fuses than high-voltage MOS pipe Q1, and the high-voltage great-current of TO-220 encapsulation is high
Pressure metal-oxide-semiconductor Q1 will not produce the phenomenons such as explosion and naked light when puncturing.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations；
For those skilled in the art, it can still be repaiied to the technical scheme described in previous embodiment
Change, or equivalent substitution is carried out to which part or all technical characteristic；And these modifications or replacement, do not make corresponding skill
The essence of art scheme departs from protection domain of the present utility model.
Claims (4)
1. a kind of safety protective circuit, it is characterised in that including the fuse F1, bridge rectifier chip BR1, high pressure being connected in series
Metal-oxide-semiconductor Q1, photoelectrical coupler U1, voltage-regulator diode Z1 and output end U0；
When output end U0 outputs are normal, the high-voltage MOS pipe Q1 is in cut-off state；When output end U0 outputs are opened
Lu Shi, the high-voltage MOS pipe Q1 closure conducting, moment produce high current fuse wire F1, make the input of circuit and civil power every
From.
2. a kind of safety protective circuit as claimed in claim 1, it is characterised in that：The safety protective circuit also includes resistance
R1, resistance R2, resistance R3 and power supply pin VOUT；
No. 2 pins of the bridge rectifier chip BR1 are connected with the zero line AC-N of civil power, and No. 3 pins are connected by fuse F1
The phase line AC-L of civil power is connected to, No. 1 pin is connected with high-voltage MOS pipe Q1 drain D, No. 4 pins are connected to high-pressure MOS simultaneously
Pipe Q1 source class S and ground, high-voltage MOS pipe Q1 grid level G are connected to ground by resistance R2；
The photoelectrical coupler U1 includes phototriode Q2 and light emitting diode D1；The colelctor electrode c of the phototriode Q2
It is connected by resistance R1 with power supply pin VOUT, emitter e is connected to ground, the anode of the light emitting diode D1 by resistance R2
It is connected with voltage-regulator diode Z1 anode, voltage-regulator diode Z1 negative electrode is connected to the positive pole of output end, light emitting diode D1's
Negative electrode is connected to the negative pole of output end by resistance R3.
3. a kind of safety protective circuit as claimed in claim 1, it is characterised in that：The fuse F1 is rated current than high
The slow fusing type fuse for pressing metal-oxide-semiconductor Q1 small.
4. a kind of safety protective circuit as claimed in claim 2, it is characterised in that：The high-voltage MOS pipe Q1 is rated current
The high-voltage MOS pipe of the TO-220 encapsulation bigger than fuse F1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621434933.2U CN206422959U (en) | 2016-12-26 | 2016-12-26 | A kind of safety protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621434933.2U CN206422959U (en) | 2016-12-26 | 2016-12-26 | A kind of safety protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206422959U true CN206422959U (en) | 2017-08-18 |
Family
ID=59576681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621434933.2U Active CN206422959U (en) | 2016-12-26 | 2016-12-26 | A kind of safety protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206422959U (en) |
-
2016
- 2016-12-26 CN CN201621434933.2U patent/CN206422959U/en active Active
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