CN102098032A - Delay switching circuit for inhibiting electrifying pulse current - Google Patents
Delay switching circuit for inhibiting electrifying pulse current Download PDFInfo
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- CN102098032A CN102098032A CN 201110043397 CN201110043397A CN102098032A CN 102098032 A CN102098032 A CN 102098032A CN 201110043397 CN201110043397 CN 201110043397 CN 201110043397 A CN201110043397 A CN 201110043397A CN 102098032 A CN102098032 A CN 102098032A
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Abstract
The invention provides a delay switching circuit for inhibiting electrifying pulse current. The delay switching circuit delays the breakover of a second switching tube through a switch delay time timing network which consists of a second resistor and a second capacitor; and when the second switching tube is switched on, a first capacitor is charged, then a first switching tube is switched on, and a battery starts to supply electricity to a main circuit. The first switching tube is connected to a main power supply loop to serve as a delay switch; when power is on, the delay switch delays a certain period of time, and then connects a power supply with the main power supply loop; the switch on of the delay switch takes variable resistance transition time from big resistance to small resistance; and the instant electrifying pulse current is effectively inhibited in time by double action of delay and variable resistance switch on, so that the aims of eliminating striking fire of battery pole pieces and reducing the electromagnetic interference of instant electrifying are fulfilled.
Description
Technical field
The present invention relates to the switching circuit technical field, particularly a kind of delay switching circuit that suppresses electric pulse current.
Background technology
The electric capacity that one constant volume is generally all arranged in the power-supplying circuit of handheld device, at powered on moment, power supply will charge to these electric capacity, thereby produce bigger pulse current.
The pulse high current of powered on moment will bring the problem of two aspects: the one, and when the battery pole piece contact is unstable, these bigger pulse currents will produce higher heat in the contact site of battery pole piece, and with the battery pole piece local melting.Rong Hua battery pole piece ambient air sharply expands and produces blast simultaneously, and the air-flow of blast produces molten metal liquid band air towards periphery spark and splashes.The 2nd, stronger electromagnetic interference is brought in the space around the pulse high current that momentary charge produces is given.
At present, the spark that battery pole piece produces when powering in order to reduce is generally made an issue of on battery pole piece material, structure and processing technology, but will increase the cost of battery pole piece like this, and effective arc control phenomenon.The explosion-proof handheld device that inflammable and explosive environment uses, produce spark for fear of battery pole piece, with application specific architecture together with battery and handheld device main frame deadlock, to reduce the probability of battery pole piece shake, but such structure dismounting cell is inconvenience quite, and when running into violent bump or falling, the hidden danger that battery pole piece produces spark still exists.Therefore, utilize the method for changing mechanical structure to can't resolve the electromagnetic interference problem that produces when powering on.
Provide a kind of current limiting switch circuit in the prior art, referring to Fig. 1.
B+1 is the positive pole of battery, and B-1 is the negative pole of battery, and VB+ is the positive pole of handheld device main circuit 100, and VB-is the negative pole of handheld device main circuit 100.
Series current sampling resistor RD in the main current supply circuit, RD is converted to sampled voltage with the operating current of circuit, control the state of the first switching tube Q1 after second switch pipe Q2 amplifies sampled voltage again, thereby the operating current of restricting circuits exceeds maximum permissible current.
Owing to will gather electric current in this circuit, be converted to sampled voltage then, control first switching tube by sampled voltage again, such Current Feedback Control process exists and postpones, the inhibitory action of the big pulse current that produces suddenly when powering on is not obvious, and the serial connection current sampling resistor will bring loss in main current supply circuit, thereby reduce the utilization ratio of battery.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of delay switching circuit that suppresses electric pulse current, can prevent effectively that battery pole piece from producing spark and the electromagnetic interference that reduces device power moment generation, can not reduce the battery utilization ratio simultaneously.
The invention provides a kind of delay switching circuit that suppresses electric pulse current, comprising: first switching tube, second switch pipe, first resistance, second resistance, first electric capacity and second electric capacity;
First end of first switching tube connects the positive pole of battery, and second end connects the positive pole of handheld device main circuit;
Connect first electric capacity between first end of first switching tube and the 3rd end;
The 3rd end of first switching tube connects second end of second switch pipe by first resistance;
The 3rd end of second switch pipe is by second capacity earth, the first end ground connection of second switch pipe;
The 3rd end of second switch pipe connects the positive pole of battery by second resistance;
The minus earth of battery, the minus earth of handheld device main circuit.
Preferably, also comprise first diode, the positive pole of first diode connects second end of second switch pipe, and negative electrode connects the 3rd end of first switching tube.
Preferably, also comprise second diode, the positive pole of second diode connects the 3rd end of second switch pipe, and negative electrode connects the positive pole of battery.
Preferably, also comprise the 3rd resistance that is connected in parallel on the first electric capacity two ends.
Preferably, also comprise the 4th resistance, the 3rd end of second switch pipe is by the 4th grounding through resistance.
Preferably, described first switching tube is a field effect transistor; Described second switch pipe is field effect transistor or transistor;
When first switching tube was field effect transistor, first end of first switching tube was a source electrode, and second end is drain electrode, and the 3rd end is a grid;
When the second switch pipe was field effect transistor, first end of second switch pipe was a source electrode, and second end is drain electrode, and the 3rd end is a grid; When the second switch pipe was transistor, first end of second switch pipe was a collector electrode, and second end is an emitter, and the 3rd end is a base stage.
The present invention also provides a kind of delay switching circuit that suppresses electric pulse current, comprising: first switching tube, second switch pipe, first resistance, second resistance, first electric capacity and second electric capacity;
First end of first switching tube connects the negative pole of battery, and second end connects the negative pole of handheld device main circuit;
The 3rd end of first switching tube is by the positive pole of first resistance connection battery, and the positive pole of battery connects the positive pole of handheld device main circuit simultaneously;
Second end of second switch pipe connects the 3rd end of first switching tube;
The 3rd end of second switch pipe connects the positive pole of battery by second electric capacity;
Be connected with first electric capacity between the 3rd end of first switching tube and first end;
The first end ground connection of second switch pipe, the 3rd end connect the negative pole of battery by second resistance;
The minus earth of handheld device main circuit.
Preferably, also comprise the 3rd resistance that is parallel to the first electric capacity two ends.
Preferably, also comprise first diode, the positive pole of first diode connects the 3rd end of first switching tube, and negative electrode connects the positive pole of battery.
Preferably, described first switching tube is a field effect transistor; Described second switch pipe is field effect transistor or transistor;
When first switching tube was field effect transistor, first end of first switching tube was a source electrode, and second end is drain electrode, and the 3rd end is a grid;
When the second switch pipe was field effect transistor, first end of second switch pipe was a source electrode, and second end is drain electrode, and the 3rd end is a grid; When the second switch pipe was transistor, first end of second switch pipe was a collector electrode, and second end is an emitter, and the 3rd end is a base stage.
Compared with prior art, the present invention has the following advantages:
Do not have current sampling resistor in the main current supply circuit of the delay switching circuit of electric pulse current in the inhibition provided by the invention, therefore do not exist resistance to bring the problem of loss, do not influence the utilization ratio of battery.The switching delay time timing network that this delay switching circuit utilizes second resistance and second electric capacity to form postpones the conducting of second switching tube, after the conducting of second switch pipe, first electric capacity just charges, just conducting of first switching tube then, and battery just begins to power for main circuit.Utilize this time difference to guarantee just to switch on behind the battery pole piece contact stabilization, can avoid battery pole piece to produce spark like this.And this delay switching circuit does not have feedback line to postpone, and Current Control speed is very fast, can effectively limit the pulse current when powering on.Circuit provided by the invention has just carried out effective restriction to charge pulse currents in the moment that main circuit is powered up, and does not need the sampling and the deterministic process of electric current, so current limliting in time fast effectively.The present invention utilizes the double action that postpones to connect and suppress charging current, has eliminated the hidden danger of battery pole piece contact sparking when powering on and the hidden danger that powered on moment produces electromagnetic interference effectively.
Description of drawings
Fig. 1 is a kind of current limiting switch circuit diagram that provides in the prior art;
Fig. 2 is delay switching circuit embodiment one structure chart of electric pulse current in the inhibition provided by the invention;
Fig. 3 is delay switching circuit embodiment two structure charts of electric pulse current in the inhibition provided by the invention;
Fig. 4 is first a switching tube conducting resistance control curve provided by the invention;
Fig. 5 is delay switching circuit embodiment three structure charts of electric pulse current in the inhibition provided by the invention;
Fig. 6 is delay switching circuit embodiment four structure charts of electric pulse current in the inhibition provided by the invention;
Fig. 7 is the input voltage of intercom when not having delay switching circuit in the prior art, postpones the output voltage and the charging current oscillogram that powers on;
Fig. 8 is the input voltage that the present invention adds intercom behind the delay switching circuit, postpones the output voltage and the charging current oscillogram that powers on.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Referring to Fig. 2, this figure is delay switching circuit embodiment one structure chart of electric pulse current in the inhibition provided by the invention.
The delay switching circuit of electric pulse current in the inhibition that present embodiment provides comprises: the first switching tube Q1, second switch pipe Q2, first resistance R 1, second resistance R 2, first capacitor C 1 and second capacitor C 2;
First end of the first switching tube Q1 connects the anodal B+1 of battery, and second end connects the anodal VB+ of handheld device main circuit 100;
Connect first capacitor C 1 between first end of the first switching tube Q1 and the 3rd end;
The 3rd end of the first switching tube Q1 connects second end of second switch pipe Q2 by first resistance R 1;
The 3rd end of second switch pipe Q2 is by second capacitor C, 2 ground connection, the first end ground connection of second switch pipe Q2;
The 3rd end of second switch pipe Q2 connects the anodal B+1 of battery by second resistance R 2;
The negative pole B-1 ground connection of battery, the negative pole VB-ground connection of handheld device main circuit 100.
Wherein, R1 and C1 form the current limliting integrating circuit; R2 and C2 form switching delay time timing network.
When the charging voltage on the C2 reaches the turn-on threshold voltage of Q2, the Q2 conducting, C1 begins charging.
After the Q2 conducting, utilize the integral characteristic of R1 and C1, delay the rise time of the bias voltage VGSQ1 of Q1.According to the control relation of bias voltage VGSQ1 and the conducting resistance Rds (on) of Q1, the conducting of Q1 exists one to hinder process by infinity to the change of complete conducting in the process of C1 charging.
Begin the charging stage at C1, the bias voltage VGSQ1 of Q1 is lower, and conducting resistance is bigger, can suppress the charge pulse currents of battery to the handheld device main circuit like this.Along with the rising of C1 charging voltage, Q1 enters complete conducting state, and this moment, conducting resistance became tens very little bold and unconstrained Europe, and so little resistance is very little to the utilization ratio influence of battery.
The concrete value of C1 and R1, so that the change of opening of Q1 hindered in transit time, power supply has been finished the charging process to main circuit, so just the charging current that powers on of the effective suppression equipment main circuit of energy.
The concrete parameter of R2 and C2 can be determined according to battery shake time of battery pole piece of packing into after the handheld device, purpose is just to make the Q1 conducting behind the battery pole piece contact stabilization, thereby guarantee that battery pole piece contacted between amphibolia, did not have big electric current to pass through on the battery pole piece.
The concrete selection of Q1 can be according to the input total capacitance decision of handheld device main circuit operating current and cell voltage and main circuit power end, gives between the main circuit charge period when guaranteeing the Q1 conducting and enough withstand voltage and power redundancy degree were all arranged between normal epoch.The battery pole piece contact shake time because of the material of pole piece and service time different with structure different having any different, be generally less than 200ms.So, the charging interval of R2 and C2 determine that going at the battery Denso after equipment surpasses 200ms, the charging voltage of C2 just reaches the turn-on threshold voltage of Q1.
Do not have current sampling resistor in the main current supply circuit of the delay switching circuit that the embodiment of the invention provides, therefore do not exist resistance to bring the problem of loss, do not influence the utilization ratio of battery.The switching delay time timing network that this delay switching circuit utilizes R2 and C2 to form postpones the conducting of Q2, and after the Q2 conducting, C1 just charges, just conducting of Q1 then, and battery just begins to power for main circuit.Utilize this time difference to guarantee just to switch on behind the battery pole piece contact stabilization, can avoid battery pole piece to produce spark like this.And this delay switching circuit does not have feedback line to postpone, and Current Control speed is very fast, can effectively limit the pulse current when powering on.
Referring to Fig. 3, this figure is delay switching circuit embodiment two structure charts of electric pulse current in the inhibition that provides of invention.
Circuit shown in Figure 3 and the difference of Fig. 2 are to have increased by the first diode D1, the second diode D2 and the 3rd resistance R 3;
The positive pole of the first diode D1 connects the 3rd end of second switch pipe Q2, and negative electrode connects the anodal B+1 of battery.
The positive pole of the second diode D2 connects second end of second switch pipe Q2, and negative electrode connects the 3rd end of the first switching tube Q1.
The two ends of first electric capacity the 3rd resistance R 3 in parallel.
The parameter value of each device can be selected following numerical value in the present embodiment:
C1＝0.01μF；C2＝1μF；R1＝100kΩ；R2＝2MΩ；R3＝1MΩ。
The first switching tube Q1 in the present embodiment is preferably P type field effect transistor (metal-oxide-semiconductor); Described second switch pipe Q2 is chosen as N type field effect transistor or negative-positive-negative transistor;
When the first switching tube Q1 was field effect transistor, first end of the first switching tube Q1 was a source electrode, and second end is drain electrode, and the 3rd end is a grid;
When second switch pipe Q2 was field effect transistor, first end of second switch pipe Q2 was a source electrode, and second end is drain electrode, and the 3rd end is a grid.When second switch pipe Q2 was transistor, first end of second switch pipe Q2 was a collector electrode, and second end is an emitter, and the 3rd end is a base stage.
The effect of D1, D2, R3 and R4 is when battery is connected interruption with main circuit, quickens the discharge of C1 and C2, thereby improves the response speed of the delay switching circuit pulse voltage that shake causes to battery pole piece.To guarantee that it is effective that the delay of switch becomes the resistance reliable in function during battery pole piece contact shake.
Can also comprise the 4th resistance R 4 in the delay switching circuit shown in Figure 3, the 3rd end of second switch pipe Q2 is by the 4th resistance R 4 ground connection.
Referring to Fig. 4, this figure is first a switching tube conducting resistance control curve provided by the invention.
As can be seen from Figure 4, the conducting resistance of Q1 is along with the variation of the gate source voltage of Q1 has a process that becomes resistance.
First switching tube in the delay switching circuit that above embodiment provides is connected between the positive pole of the positive pole of battery and main circuit, introduce another identical embodiment of operation principle below, between the negative pole of different is this first switching tube is connected on battery and the negative pole of main circuit, the first switching tube Q1 has made N type field effect transistor into.
Referring to Fig. 5, this figure is delay switching circuit embodiment three structure charts of electric pulse current in the inhibition provided by the invention.
The delay switching circuit of electric pulse current in the inhibition that present embodiment provides comprises: the first switching tube Q1, second switch pipe Q2, first resistance R 1, second resistance R 2, first capacitor C 1 and second capacitor C 2;
First end of the first switching tube Q1 connects the negative pole B-1 of battery, and second end connects the negative pole VB-of handheld device main circuit 100;
The 3rd end of the first switching tube Q1 is by the anodal B+1 of first resistance R, 1 connection battery, and the anodal B+1 of battery connects the anodal VB+ of handheld device main circuit 100 simultaneously;
Second end of second switch pipe Q2 connects the 3rd end of the first switching tube Q1;
The 3rd end of second switch pipe Q2 connects the positive pole of battery by second capacitor C 2;
Be connected with first capacitor C 1 between the 3rd end of the first switching tube Q1 and first end;
The first end ground connection of second switch pipe Q2, the 3rd end connect the negative pole B+1 of battery by second resistance R 1;
The negative pole VB-ground connection of handheld device main circuit.
The operation principle of circuit shown in Figure 5 and circuit shown in Figure 2 is basic identical, and just Q2 ends, and Q1 could conducting.Powered on moment, the anodal B+1 of battery makes the Q2 conducting by the 3rd end that C2 is added to Q2, and second end of Q2 conduction period Q1 and the 3rd end are not had bias voltage by short circuit and end.Along with the charging of C2, the voltage of Q2 the 3rd end drops to below the turn-on threshold voltage, and after Q2 ended, C1 just began to charge and finishes the control procedure of opening of Q1.
For circuit shown in Figure 5, the embodiment of the invention also provides a kind of delay switching circuit, referring to shown in Figure 6, with the difference of Fig. 5 be to have increased by the first diode D1 and the 3rd resistance R 3.
The effect of the first diode D1 and the 3rd resistance R 3 is in order to be connected with main circuit at battery when interrupting, to quicken the discharge of C1 and C2, thereby improve the response speed of the delay switching circuit pulse voltage that shake causes to battery pole piece.
Be that transmitting power is the oscillogram of the intercom circuit correspondence of 5W below with the handheld device, the oscillogram that contrast does not have delay switching circuit provided by the invention and adds delay switching circuit provided by the invention embodies the beneficial effect that the present invention brings.
Referring to Fig. 7, this figure is the input voltage of intercom when not having delay switching circuit in the prior art, postpones the output voltage and the charging current oscillogram that powers on.
Referring to Fig. 8, this figure is the input voltage that the present invention adds intercom behind the delay switching circuit, postpones the output voltage and the charging current oscillogram that powers on.
As can be seen from Figures 7 and 8, when cell voltage was 7.4V, the pulse current peak that powers on dropped to 0.26A by 12A, and the switching delay ON time is 428ms.This shows that delay switching circuit of the present invention has reduced pulse current by a relatively large margin, can prevent effectively that like this battery pole piece from producing spark.
The present invention utilizes the big resistance of metal-oxide-semiconductor conducting starting stage to limit the charging current of main circuit voltage, and the change when prolonging the MOS conducting hinders transit time to finish the charging process of battery to main circuit.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. the delay switching circuit of electric pulse current in the inhibition is characterized in that, comprising: first switching tube, second switch pipe, first resistance, second resistance, first electric capacity and second electric capacity;
First end of first switching tube connects the positive pole of battery, and second end connects the positive pole of handheld device main circuit;
Connect first electric capacity between first end of first switching tube and the 3rd end;
The 3rd end of first switching tube connects second end of second switch pipe by first resistance;
The 3rd end of second switch pipe is by second capacity earth, the first end ground connection of second switch pipe;
The 3rd end of second switch pipe connects the positive pole of battery by second resistance;
The minus earth of battery, the minus earth of handheld device main circuit.
2. delay switching circuit according to claim 1 is characterized in that, also comprises first diode, and the positive pole of first diode connects second end of second switch pipe, and negative electrode connects the 3rd end of first switching tube.
3. delay switching circuit according to claim 1 is characterized in that, also comprises second diode, and the positive pole of second diode connects the 3rd end of second switch pipe, and negative electrode connects the positive pole of battery.
4. delay switching circuit according to claim 1 is characterized in that, also comprises the 3rd resistance that is connected in parallel on the first electric capacity two ends.
5. delay switching circuit according to claim 1 is characterized in that, also comprises the 4th resistance, and the 3rd end of second switch pipe is by the 4th grounding through resistance.
6. according to each described delay switching circuit of claim 1-5, it is characterized in that described first switching tube is a field effect transistor; Described second switch pipe is field effect transistor or transistor;
When first switching tube was field effect transistor, first end of first switching tube was a source electrode, and second end is drain electrode, and the 3rd end is a grid;
When the second switch pipe was field effect transistor, first end of second switch pipe was a source electrode, and second end is drain electrode, and the 3rd end is a grid; When the second switch pipe was transistor, first end of second switch pipe was a collector electrode, and second end is an emitter, and the 3rd end is a base stage.
7. the delay switching circuit of electric pulse current in the inhibition is characterized in that, comprising: first switching tube, second switch pipe, first resistance, second resistance, first electric capacity and second electric capacity;
First end of first switching tube connects the negative pole of battery, and second end connects the negative pole of handheld device main circuit;
The 3rd end of first switching tube is by the positive pole of first resistance connection battery, and the positive pole of battery connects the positive pole of handheld device main circuit simultaneously;
Second end of second switch pipe connects the 3rd end of first switching tube;
The 3rd end of second switch pipe connects the positive pole of battery by second electric capacity;
Be connected with first electric capacity between the 3rd end of first switching tube and first end;
The first end ground connection of second switch pipe, the 3rd end connect the negative pole of battery by second resistance;
The minus earth of handheld device main circuit.
8. delay switching circuit according to claim 7 is characterized in that, also comprises the 3rd resistance that is parallel to the first electric capacity two ends.
9. delay switching circuit according to claim 7 is characterized in that, also comprises first diode, and the positive pole of first diode connects the 3rd end of first switching tube, and negative electrode connects the positive pole of battery.
10. according to each described delay switching circuit of claim 7-9, it is characterized in that described first switching tube is a field effect transistor; Described second switch pipe is field effect transistor or transistor;
When first switching tube was field effect transistor, first end of first switching tube was a source electrode, and second end is drain electrode, and the 3rd end is a grid;
When the second switch pipe was field effect transistor, first end of second switch pipe was a source electrode, and second end is drain electrode, and the 3rd end is a grid; When the second switch pipe was transistor, first end of second switch pipe was a collector electrode, and second end is an emitter, and the 3rd end is a base stage.
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| CN109075593B (en) * | 2017-12-20 | 2022-07-12 | 深圳市大疆创新科技有限公司 | Power-on slow start device, battery assembly, unmanned aerial vehicle and method |
| CN109075593A (en) * | 2017-12-20 | 2018-12-21 | 深圳市大疆创新科技有限公司 | Power on relaxed starter, battery component, unmanned plane and method |
| CN109962463A (en) * | 2017-12-25 | 2019-07-02 | 海能达通信股份有限公司 | Stabilization power switch circuit and electronic equipment |
| CN108599119B (en) * | 2018-04-17 | 2019-09-10 | 深圳市科比特航空科技有限公司 | Unmanned plane switching circuit and unmanned plane |
| CN108599119A (en) * | 2018-04-17 | 2018-09-28 | 深圳市科比特航空科技有限公司 | Unmanned plane switching circuit and unmanned plane |
| CN109378810A (en) * | 2018-11-12 | 2019-02-22 | 西安昆仑工业（集团）有限责任公司 | A kind of small-bore aircraft gun power-off protection dash current suppression circuit |
| CN109672434A (en) * | 2018-12-24 | 2019-04-23 | 优数通（北京）科技有限公司 | A kind of automobile electronic controller supply voltage delay unlatching protection circuit |
| CN112434400A (en) * | 2020-10-15 | 2021-03-02 | 北京交通大学 | MOSFET grid source voltage interference conduction path model |
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| CN102098032B (en) | 2014-02-12 |
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