CN204794010U - Prevent surge circuit - Google Patents
Prevent surge circuit Download PDFInfo
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- CN204794010U CN204794010U CN201520581776.7U CN201520581776U CN204794010U CN 204794010 U CN204794010 U CN 204794010U CN 201520581776 U CN201520581776 U CN 201520581776U CN 204794010 U CN204794010 U CN 204794010U
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Abstract
The utility model relates to a protection circuit, a prevent surge circuit specifically says so. It includes and anodal bus and negative pole bus is used for the connected load circuit between the output of anodal bus and negative pole bus. Its characteristics are it has first resistance and second resistance to establish ties between the input of anodal bus and negative pole bus. Be connected with ON -OFF control circuit between anodal bus and negative pole bus, the wire that ON -OFF control circuit's sense terminal passes through between wire and first resistance and the second resistance links to each other. Having electric control switch in the anodal bus of that section between ON -OFF control circuit and the anodal bus out end, perhaps having electric control switch in that section negative pole bus between ON -OFF control circuit and the negative pole bus out end, it is continuous with electric control switch's control electrode that ON -OFF control circuit's control end passes through the wire. With this circuit arrangement between power and load circuit, no matter surge voltage lasts long, can both play the guard action to load circuit, and can reduce load circuit's use cost.
Description
Technical field
The utility model relates to a kind of protective circuit, is specifically to be arranged between power supply and load, when starting shooting or by external interference, prevents voltage surge from causing the anti-surge circuit of damage to load.
Background technology
Surge is surge again, as the term suggests be exactly the peak value occurring exceeding stationary value instantaneously, it comprise surge voltage and
surge current, generally appear at the moment that power supply is connected.In essence, surge is the violent pulse of the one occurred in very short time, even if can time compole short, if acted directly on the load circuit that is connected with power supply, nearly all can cause the damage of load circuit.Therefore, often need to arrange anti-surge circuit between power supply and load circuit, impaired to protect load circuit to avoid.
Traditional anti-surge circuit is exactly be connected TVS pipe between the both positive and negative polarity between power supply with load circuit, namely transient voltage suppressor, and it can suppress surge voltage, protects load circuit.But TVS pipe is all Microsecond grade to the guard time of load circuit, if the time that surge voltage continues is longer or the time is indefinite; single TVS pipe is often difficult to play protect completely; if and increase the quantity of TVS pipe, be then easy to the damage causing indivedual TVS pipe, be not suitable in parallel use.In addition, the cost of TVS pipe is higher, can increase the use cost of load circuit.
Utility model content
Problem to be solved in the utility model is to provide a kind of anti-surge circuit, is arranged between power supply and load circuit by this circuit, and no matter surge voltage lasts long, and can play a protective role to load circuit, and can reduce the use cost of load circuit.
For solving the problem, take following technical scheme:
Anti-surge circuit of the present utility model comprises positive bus and negative bus, for connecting load circuit between positive bus and the output of negative bus.The first resistance and the second resistance is in series with between the input being characterized in described positive bus and negative bus.Be connected with ON-OFF control circuit between described positive bus and negative bus, the test side of ON-OFF control circuit is connected with the wire between the first resistance and the second resistance by wire.That section of positive bus between described ON-OFF control circuit and positive bus output there is electric-controlled switch, or that section of negative bus between ON-OFF control circuit and negative bus output has electric-controlled switch, and the control end of ON-OFF control circuit is extremely connected with the control of electric-controlled switch by wire.
Wherein, described electric-controlled switch is switch mosfet, and switch mosfet comprises source electrode, drain electrode and gate pole, and its gate pole is and controls pole.Described ON-OFF control circuit comprises triode, the 3rd resistance, voltage-stabiliser tube and the 4th resistance.When in that section of positive bus of described switch mosfet between ON-OFF control circuit and positive bus output, described triode is connected in parallel on described first resistance two ends, the emitter of triode is connected with positive bus, and the base stage of triode is connected with one end of the corresponding negative bus of the first resistance; Described 3rd resistance and voltage-stabiliser tube are connected in parallel between the emitter of triode and collector electrode successively; The two ends of described 4th resistance are connected with the collector electrode of triode, negative bus respectively; The source electrode of described switch mosfet is corresponding with the negative electrode of voltage-stabiliser tube, and drain corresponding with the output of positive bus, gate pole is connected with the anode of voltage-stabiliser tube by wire.When in that section of negative bus of described switch mosfet between ON-OFF control circuit and negative bus output, described triode is connected in parallel on described second resistance two ends, the emitter of triode is connected with negative bus, and the base stage of triode is connected with one end of the corresponding positive bus of the second resistance.Described 3rd resistance and voltage-stabiliser tube are connected in parallel between the emitter of triode and collector electrode successively.The two ends of described 4th resistance are connected with the collector electrode of triode, positive bus respectively.The source electrode of described switch mosfet is corresponding with the anode of voltage-stabiliser tube, and drain corresponding with the output of negative bus, gate pole is connected with the negative electrode of voltage-stabiliser tube by wire.When positive bus being connected with the both positive and negative polarity of power supply with negative bus, the first resistance and the second resistance can detect supply voltage, and provide the bias voltage between the base stage of triode and emitter.When supply voltage is lower than protection voltage threshold (namely not occurring surge voltage), the emitter of triode and collector electrode disconnect, now the 3rd resistance and the 4th resistance carry out dividing potential drop to supply voltage, the voltage at the 3rd resistance two ends acts between the gate pole of switch mosfet and source electrode, switch mosfet is closed, source electrode and drain electrode conducting, supply voltage can enter load circuit and carry out normal power supply to it; When supply voltage is higher than protection voltage threshold (namely occurring surge voltage); the emitter of triode and collector electrode conducting; its both end voltage is down to close to 0; be equivalent to the 3rd resistive short; the voltage then acted between switch mosfet gate pole and source electrode is also down to close to 0; switch mosfet is disconnected, and source electrode disconnects with drain electrode, and supply voltage cannot be powered to load circuit.
Take such scheme, have the following advantages:
Because anti-surge circuit of the present utility model is in series with the first resistance and the second resistance between the input of positive bus and negative bus, ON-OFF control circuit is connected with between positive bus and negative bus, the test side of ON-OFF control circuit is connected with the wire between the first resistance and the second resistance by wire, that section of positive bus between ON-OFF control circuit and positive bus output there is electric-controlled switch, or that section of negative bus between ON-OFF control circuit and negative bus output there is electric-controlled switch, the control end of ON-OFF control circuit is extremely connected with the control of electric-controlled switch by wire.Therefore, when positive bus being connected with the both positive and negative polarity of power supply with negative bus, ON-OFF control circuit can detect the voltage Vs between the first resistance and the second resistance, and compared with the protection voltage threshold Vth default with ON-OFF control circuit.When namely Vs does not occur surge voltage lower than Vth() time, the control that ON-OFF control circuit controls electric-controlled switch is extremely closed, and namely positive bus or negative bus are communicated with, and supply voltage can enter load circuit and carry out normal power supply to it; When namely Vs occurs surge voltage higher than Vth() time, the control pole that ON-OFF control circuit controls electric-controlled switch is opened, and namely positive bus or negative bus disconnect, and supply voltage cannot be powered to load circuit.So anti-surge circuit of the present utility model is not by the restriction of time, and no matter surge voltage lasts long, and it can be protected load circuit.And the assembly that this circuit uses is general purpose module, and its cost is lower, can reduce the use cost of load circuit.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment one of anti-surge circuit of the present utility model;
Fig. 2 is the detailed circuit schematic of Fig. 1;
Fig. 3 is the schematic diagram of the embodiment two of anti-surge circuit of the present utility model;
Fig. 4 is the detailed circuit schematic of Fig. 3;
Fig. 5 is the design sketch of anti-surge circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Embodiment one
As depicted in figs. 1 and 2, anti-surge circuit of the present utility model comprises positive bus VM+ and negative bus VM-, for connecting load circuit between positive bus VM+ and the output of negative bus VM-.The first resistance R1 and the second resistance R2 is in series with between the input of described positive bus VM+ and negative bus VM-.Be connected with ON-OFF control circuit between described positive bus VM+ and negative bus VM-, the test side of ON-OFF control circuit is connected with the wire between the first resistance R1 and the second resistance R2 by wire.That section of positive bus VM+ between described ON-OFF control circuit and positive bus VM+ output has electric-controlled switch SW, and the control end of ON-OFF control circuit is extremely connected by the control of wire with electric-controlled switch SW.
Wherein, described electric-controlled switch SW is switch mosfet Q1, and switch mosfet Q1 comprises source S, drain D and gate pole G, and its gate pole G is and controls pole.Described ON-OFF control circuit comprises triode Q2, the 3rd resistance R3, voltage-stabiliser tube Z1 and the 4th resistance R4.Described triode Q2 is connected in parallel on described first resistance R1 two ends, and the emitter e of triode Q2 is connected with positive bus VM+, and the base stage b of triode Q2 is connected with one end of the corresponding negative bus VM-of the first resistance R1.Described 3rd resistance R3 and voltage-stabiliser tube Z1 is connected in parallel between the emitter e of triode Q2 and collector electrode c successively.The two ends of described 4th resistance R4 are connected with collector electrode c, the negative bus VM-of triode Q2 respectively.The source S of described switch mosfet Q1 is corresponding with the negative electrode of voltage-stabiliser tube Z1, and drain D is corresponding with the output of positive bus VM+, and gate pole G is connected by the anode of wire with voltage-stabiliser tube Z1.
Embodiment two
As shown in Figure 3 and Figure 4, anti-surge circuit of the present utility model comprises positive bus VM+ and negative bus VM-, for connecting load circuit between positive bus VM+ and the output of negative bus VM-.The first resistance R1 and the second resistance R2 is in series with between the input of described positive bus VM+ and negative bus VM-.Be connected with ON-OFF control circuit between described positive bus VM+ and negative bus VM-, the test side of ON-OFF control circuit is connected with the wire between the first resistance R1 and the second resistance R2 by wire.That section of negative bus VM-between described ON-OFF control circuit and negative bus VM-output has electric-controlled switch SW, and the control end of ON-OFF control circuit is extremely connected by the control of wire with electric-controlled switch SW.
Wherein, described electric-controlled switch SW is switch mosfet Q1, and switch mosfet Q1 comprises source S, drain D and gate pole G, and its gate pole G is and controls pole.Described ON-OFF control circuit comprises triode Q2, the 3rd resistance R3, voltage-stabiliser tube Z1 and the 4th resistance R4.Described triode Q2 is connected in parallel on described second resistance R2 two ends, and the emitter e of triode Q2 is connected with negative bus VM-, and the base stage b of triode Q2 is connected with one end of the corresponding positive bus VM+ of the second resistance R2.Described 3rd resistance R3 and voltage-stabiliser tube Z1 is connected in parallel between the emitter e of triode Q2 and collector electrode c successively.The two ends of described 4th resistance R4 are connected with collector electrode c, the positive bus VM+ of triode Q2 respectively.The source S of described switch mosfet Q1 is corresponding with the anode of voltage-stabiliser tube Z1, and drain D is corresponding with the output of negative bus VM-, and gate pole G is connected by the negative electrode of wire with voltage-stabiliser tube Z1.
In above-mentioned two embodiments, when being connected with the both positive and negative polarity of power supply with negative bus VM-by positive bus VM+, the first resistance R1 and the second resistance R2 can detect supply voltage, and provides the bias voltage between the base stage b of triode Q2 and emitter e.When namely supply voltage Vs does not occur surge voltage lower than protection voltage threshold Vth() time, emitter e and the collector electrode c of triode Q2 disconnect, now the 3rd resistance R3 and the 4th resistance R4 carries out dividing potential drop to supply voltage Vs, the voltage at the 3rd resistance R3 two ends acts between the gate pole G of switch mosfet Q1 and source S, switch mosfet Q1 is closed, source S and drain D conducting, positive bus VM+ conducting, supply voltage can enter load circuit and carry out normal power supply to it, the positive terminal voltage VL=Vs of load circuit; When namely supply voltage Vs occurs surge voltage higher than protection voltage threshold Vth() time; the emitter e of triode Q2 and collector electrode c conducting; its both end voltage is down to close to 0, and be equivalent to the 3rd resistance R3 short circuit, then the voltage acted between switch mosfet Q1 gate pole G and source S is also down to close to 0; switch mosfet Q1 is disconnected; source S and drain D disconnect, and positive bus VM+ disconnects, and supply voltage cannot be powered to load circuit; the positive terminal voltage VL=0 of load circuit, as shown in Figure 5.
In current auto manufacturing; during due to automobile starting or by external environmental interference; its surge voltage produced is very large on the impact of mobile unit; therefore nearly all mobile unit (as LCDs, navigator, driver etc.) all needs when manufacturing and designing to carry expensive protective circuit, otherwise these mobile units are easy to occur damaging.Anti-surge circuit of the present utility model is applied in auto manufacturing; common power source circuit switch is replaced with a more expensive electric-controlled switch SW and other universal component; just can cancel protective circuit (as TVS pipe etc.) expensive on mobile unit, greatly can reduce the manufacturing cost of automobile like this.
Claims (4)
1. an anti-surge circuit, comprises positive bus (VM+) and negative bus (VM-), for connecting load circuit between the output of positive bus (VM+) and negative bus (VM-); The first resistance (R1) and the second resistance (R2) is in series with between the input that it is characterized in that described positive bus (VM+) and negative bus (VM-); Be connected with ON-OFF control circuit between described positive bus (VM+) and negative bus (VM-), the test side of ON-OFF control circuit is connected with the wire between the first resistance (R1) and the second resistance (R2) by wire; That section of positive bus (VM+) between described ON-OFF control circuit and positive bus (VM+) output there is electric-controlled switch (SW), or that section of negative bus (VM-) between ON-OFF control circuit and negative bus (VM-) output has electric-controlled switch (SW), and the control end of ON-OFF control circuit is extremely connected by the control of wire with electric-controlled switch (SW).
2. anti-surge circuit as claimed in claim 1, is characterized in that described electric-controlled switch (SW) is for switch mosfet (Q1), and switch mosfet (Q1) comprises source electrode (S), drain electrode (D) and gate pole (G), and its gate pole (G) is and controls pole.
3. anti-surge circuit as claimed in claim 2, is characterized in that described ON-OFF control circuit comprises triode (Q2), the 3rd resistance (R3), voltage-stabiliser tube (Z1) and the 4th resistance (R4); When described switch mosfet (Q1) is positioned in that section of positive bus (VM+) between ON-OFF control circuit and positive bus (VM+) output, described triode (Q2) is connected in parallel on described first resistance (R1) two ends, the emitter (e) of triode (Q2) is connected with positive bus (VM+), and the base stage (b) of triode (Q2) is connected with one end of the first resistance (R1) corresponding negative bus (VM-); Between the emitter (e) that described 3rd resistance (R3) and voltage-stabiliser tube (Z1) are connected in parallel on triode (Q2) successively and collector electrode (c); The two ends of described 4th resistance (R4) are connected with the collector electrode (c) of triode (Q2), negative bus (VM-) respectively; The source electrode (S) of described switch mosfet (Q1) is corresponding with the negative electrode of voltage-stabiliser tube (Z1), and drain electrode (D) is corresponding with the output of positive bus (VM+), and gate pole (G) is connected by the anode of wire with voltage-stabiliser tube (Z1).
4. anti-surge circuit as claimed in claim 2, is characterized in that described ON-OFF control circuit comprises triode (Q2), the 3rd resistance (R3), voltage-stabiliser tube (Z1) and the 4th resistance (R4); When described switch mosfet (Q1) is positioned in that section of negative bus (VM-) between ON-OFF control circuit and negative bus (VM-) output, described triode (Q2) is connected in parallel on described second resistance (R2) two ends, the emitter (e) of triode (Q2) is connected with negative bus (VM-), and the base stage (b) of triode (Q2) is connected with one end of the second resistance (R2) corresponding positive bus (VM+); Between the emitter (e) that described 3rd resistance (R3) and voltage-stabiliser tube (Z1) are connected in parallel on triode (Q2) successively and collector electrode (c); The two ends of described 4th resistance (R4) are connected with the collector electrode (c) of triode (Q2), positive bus (VM+) respectively; The source electrode (S) of described switch mosfet (Q1) is corresponding with the anode of voltage-stabiliser tube (Z1), and drain electrode (D) is corresponding with the output of negative bus (VM-), and gate pole (G) is connected by the negative electrode of wire with voltage-stabiliser tube (Z1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520581776.7U CN204794010U (en) | 2015-08-05 | 2015-08-05 | Prevent surge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520581776.7U CN204794010U (en) | 2015-08-05 | 2015-08-05 | Prevent surge circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204794010U true CN204794010U (en) | 2015-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520581776.7U Active CN204794010U (en) | 2015-08-05 | 2015-08-05 | Prevent surge circuit |
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| CN (1) | CN204794010U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728507A (en) * | 2017-08-31 | 2018-02-23 | 重庆市爱伦吉科技有限公司 | Controller and control system between Intelligent sanitary |
| CN111092546A (en) * | 2019-12-26 | 2020-05-01 | 杭州电子科技大学 | Surge suppression slow starting circuit for supporting hot plugging |
-
2015
- 2015-08-05 CN CN201520581776.7U patent/CN204794010U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728507A (en) * | 2017-08-31 | 2018-02-23 | 重庆市爱伦吉科技有限公司 | Controller and control system between Intelligent sanitary |
| CN111092546A (en) * | 2019-12-26 | 2020-05-01 | 杭州电子科技大学 | Surge suppression slow starting circuit for supporting hot plugging |
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| GR01 | Patent grant |