CN204271621U - A kind of reversal connection of battery recharger port and short-circuit protection - Google Patents
A kind of reversal connection of battery recharger port and short-circuit protection Download PDFInfo
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- CN204271621U CN204271621U CN201420773686.3U CN201420773686U CN204271621U CN 204271621 U CN204271621 U CN 204271621U CN 201420773686 U CN201420773686 U CN 201420773686U CN 204271621 U CN204271621 U CN 204271621U
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- effect transistor
- field effect
- circuit
- discharging current
- charging
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The utility model discloses a kind of reversal connection and short-circuit protection of battery recharger port, over-voltage detection circuit is connected in parallel between charging anode and charging negative terminal, charging anode is connected with battery pack positive terminal, charging negative terminal is by discharging current testing circuit, discharging current turns off field effect transistor, charge protection field effect transistor is connected with battery pack negative terminal, the S pole of charge protection field effect transistor connects the S pole that discharging current turns off field effect transistor, the D pole that discharging current turns off field effect transistor connects charging negative terminal, discharging current turns off field effect transistor by square wave circuit for generating and discharging current testing circuit co-controlling.When this protective device can have an electric current of course of discharge on charging port, when detecting that the voltage of charging port exceedes set point, reverse charging voltage is when being connected to charging port, and protection battery pack and circuit, make the fail safe of battery obtain guarantee.
Description
Technical field
The utility model belongs to cell charge protection field, specifically a kind of reversal connection of battery recharger port and short-circuit protection.
Background technology
Along with the development of lithium battery technology and the requirement of environmental protection, the equipment of increasing power type, as electric bicycle, battery-operated motor cycle, electric tool etc., all adopts lithium battery as power supply.The feature of power type equipment is that discharging current is larger, and charging current is relatively little.For the cost of saving li-ion cell protection circuit and the loss reduced in discharge process; charging and discharging terminals are all separated into two independently ports by the battery of usual power type; electric discharge port can heavy-current discharge and only for electric discharge, charging port is only applicable to low current charge.Discharged when charging port is by mistake connected on power type equipment, or during the short circuit of port positive-negative polarity, excessive discharging current has the possibility damaging charge protection circuit.
Because motive-power battery charging port selects several interfaces few in number usually; polarity may the incorrect or incorrect charging device of charging voltage charge the battery by user; the protection circuit of most of motive-power battery is not to the restriction circuit of charging voltage and the circuit preventing charging device reversal connection, and the fail safe of battery can not get ensureing.
Utility model content
The purpose of this utility model is the reversal connection and the short-circuit protection that provide a kind of battery recharger port, when connecting charging voltage at charging port and when having discharging current, turning off discharging current shutdown switch, make charging port externally not discharge again; When detecting that the voltage of charging port exceedes set point, control charging current turn-off switch OFF; When reverse charging voltage is connected to charging port, automatically shut down the connection of charging port and battery; When charging port there is no charging voltage, automatically stopping to protective device circuit supply, realizing zero-power.
For achieving the above object, the utility model provides following technical scheme:
The reversal connection of battery recharger port and a short-circuit protection, comprise power supply voltage stabilizing circuit, over-voltage detection circuit, discharging current testing circuit, square wave circuit for generating, charge protection field effect transistor, discharging current turns off field effect transistor and discharging current turns off field effect transistor drive circuit; Described discharging current turns off field effect transistor and turns off the driving of field effect transistor drive circuit by discharging current; Described over-voltage detection circuit is connected in parallel between charging anode and charging negative terminal; charging anode is connected with battery pack positive terminal; charging negative terminal turns off field effect transistor by discharging current testing circuit, discharging current, charge protection field effect transistor is connected with battery pack negative terminal; the S pole of charge protection field effect transistor connects the S pole that discharging current turns off field effect transistor; the D pole that discharging current turns off field effect transistor connects charging negative terminal, and discharging current turns off field effect transistor and turned on and off by square wave circuit for generating and discharging current testing circuit co-controlling.
As further program of the utility model: described power supply voltage stabilizing circuit comprises current-limiting resistance and voltage stabilizing didoe, for other element circuit provides stable voltage, the reverse pincers pressure effect of voltage stabilizing didoe guarantees that other element circuit can not damage when charging device reversal connection.
As further program of the utility model: the field effect transistor that described charge protection field effect transistor and discharging current turn off field effect transistor used is golden oxygen oxide field-effect pipe (MOSFET).
As further program of the utility model: described square wave circuit for generating and discharging current testing circuit all adopt amplifier to realize, cheap double operational or the single amplifier device of the above structure of double operational can be adopted, two kinds of functions of realizing circuit.
As further program of the utility model: described over-voltage detection circuit comprises a controlled source of stable pressure and two divider resistances, the voltage of detection is regulated by two divider resistances; When detecting that voltage exceedes set point, controlled source of stable pressure drives triode ON, controls the shutoff of charge protection field effect transistor.
Compared with prior art, the beneficial effects of the utility model are: this protective device can when charging port has the electric current of course of discharge, when detecting that the voltage of charging port exceedes set point, reverse charging voltage is when being connected to charging port, protection battery pack and circuit, make the fail safe of battery obtain guarantee; When charging port does not have charging voltage, automatically stop to protective device circuit supply, realize zero-power.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model;
Fig. 2 is the circuit diagram of square wave circuit for generating of the present utility model;
Fig. 3 is the output voltage waveforms of square wave circuit for generating of the present utility model;
Fig. 4 is the circuit diagram of discharging current testing circuit of the present utility model;
Fig. 5 is the circuit diagram of over-voltage detection circuit of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, charging positive terminal is connected to battery anode, and charging negative terminal turns off field effect transistor Q45, charge protection field effect transistor Q43 by discharging current testing circuit, discharging current, and battery protection testing circuit is connected to battery cathode.Discharging current turns off field effect transistor Q45 and controls conducting or shutoff by square wave circuit for generating and discharging current testing circuit, when square wave circuit for generating and discharging current testing circuit all export high level, and Q45 conducting; When square wave circuit for generating or discharging current testing circuit have either party output low level, Q45 turns off.Charge protection field effect transistor Q43 is controlled by battery protection testing circuit and over-voltage detection circuit, when battery protection testing circuit charging control output end and over-voltage detection circuit output all export high level time, Q43 conducting; Otherwise Q43 turns off charging current.
As further program of the utility model: described square wave circuit for generating as shown in Figure 2, when circuit initially powers on, C11 voltage is OV, it is also OV that the reverse input end of amplifier U1-A connects C11 voltage, the positive input of U1-A is powered by R11, R13 dividing potential drop by VCC, U1-A forward input voltage is larger than reverse input voltage, and amplifier exports the high level close to VCC voltage.Now, amplifier positive input voltage approximates VCC and subtracts D11 voltage drop=VCC-0.7V, and meanwhile, amplifier output voltage is charged to C11 by R10; Along with the increase in charging interval, C11 voltage constantly raises, and when the voltage of C11 is greater than the voltage of amplifier positive input, amplifier exports and becomes low level, now, amplifier positive input voltage=VCC*R11/ (R11+R13), meanwhile, C11 is discharged to amplifier output by the series circuit of R10 and R12 and D10, along with discharge time increases, C11 voltage reduces, and when C11 voltage is lower than amplifier positive input voltage, the upset of amplifier output voltage becomes high level.This process constantly repeats.
By increasing the resistance of R10, reducing the resistance of R12, capacitor charging time being transported and is longer than discharge time, thus the time fortune making amplifier export high level is longer than the low level time, amplifier exports voltage waveform as shown in Figure 3.This output voltage high level controlled discharge switch off current field effect transistor Q45 conducting, low level control discharging current turns off field effect transistor Q45 and turns off.The Q45 turn-off time of short period can reduce the impact on charge efficiency when Q45 turns off.
As further program of the utility model: described discharging current testing circuit as shown in Figure 4, R24 is as discharging current sampling resistor, this resistance one end is connected charging negative terminal and is connected to the inverse output terminal of amplifier by R23, and the other end is connected to U2-B and powers ground be connected to the D pole of Q45; VCC voltage is applied to amplifier U2-B positive input by R22, R25 dividing potential drop.Powered on moment, the C21 be connected in parallel on R25 can guarantee that U2-B first exports high level, and Q20 conducting makes the voltage of VCC can not be applied to amplifier reverse input end; When charging port has discharging current, R24 is upper, and to produce charging negative terminal direction be the voltage of forward, and the voltage when electric current is enough large on R24 is greater than the voltage of R22, amplifier output low level, Q20 end, VCC voltage by R20 and R21 connect, then with R23 dividing potential drop after, be applied to amplifier reverse input end, resistance selects R22=R23, and (R20+R21) is slightly less than R25, can ensure after U2-B detects discharging current, maintain low level output, until re-power always.
As further program of the utility model: the power supply of described square wave circuit for generating and discharging current testing circuit amplifier, supplied by the voltage stabilizing circuit of R43 and Z41, when this voltage stabilizing circuit can guarantee that charging voltage forward connects, provide stable voltage; When charging voltage Opposite direction connection, by the forward conduction clamping action of Z41, reverse voltage is limited to about 0.7V, the element circuits such as amplifier can not be damaged.
As further program of the utility model: overvoltage detection line forms voltage detecting circuit by controlled source of stable pressure U30 and R33-34, as shown in Figure 5, testing circuit is parallel to charging anode and charging negative terminal, detect voltage to be set by the resistance of R33 and R34, detect voltage=controlled source of stable pressure reference voltage * (R33+R34)/R34.When charging port voltage is greater than detection voltage, Q31 conducting, then control Q30 conducting, control charge protection field effect transistor Q43 and turn off, stop charging.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (4)
1. the reversal connection of battery recharger port and a short-circuit protection, comprises power supply voltage stabilizing circuit, over-voltage detection circuit, discharging current testing circuit, square wave circuit for generating, charge protection field effect transistor, discharging current turns off field effect transistor and discharging current turns off field effect transistor drive circuit; Described discharging current turns off field effect transistor and turns off the driving of field effect transistor drive circuit by discharging current; Described over-voltage detection circuit is connected in parallel between charging anode and charging negative terminal; charging anode is connected with battery pack positive terminal; charging negative terminal turns off field effect transistor by discharging current testing circuit, discharging current, charge protection field effect transistor is connected with battery pack negative terminal; the S pole of charge protection field effect transistor connects the S pole that discharging current turns off field effect transistor, and the D pole that discharging current turns off field effect transistor connects charging negative terminal.
2. the reversal connection of battery recharger port according to claim 1 and short-circuit protection, it is characterized in that, described power supply voltage stabilizing circuit comprises current-limiting resistance and voltage stabilizing didoe.
3. the reversal connection of battery recharger port according to claim 1 and short-circuit protection, is characterized in that, the field effect transistor that described charge protection field effect transistor and discharging current turn off field effect transistor used is golden oxygen oxide field-effect pipe.
4. the reversal connection of battery recharger port according to claim 1 and short-circuit protection, it is characterized in that, described over-voltage detection circuit comprises a controlled source of stable pressure and two divider resistances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420773686.3U CN204271621U (en) | 2014-12-11 | 2014-12-11 | A kind of reversal connection of battery recharger port and short-circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420773686.3U CN204271621U (en) | 2014-12-11 | 2014-12-11 | A kind of reversal connection of battery recharger port and short-circuit protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204271621U true CN204271621U (en) | 2015-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420773686.3U Expired - Fee Related CN204271621U (en) | 2014-12-11 | 2014-12-11 | A kind of reversal connection of battery recharger port and short-circuit protection |
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| CN (1) | CN204271621U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018090924A1 (en) * | 2016-11-18 | 2018-05-24 | 深圳创维数字技术有限公司 | Over-voltage and reverse connection protection circuit and device thereof |
| CN109638903A (en) * | 2018-11-29 | 2019-04-16 | 北斗天地股份有限公司山东分公司 | A kind of battery and its protection circuit, intrinsic safety type smart phone |
| CN110890744A (en) * | 2019-12-26 | 2020-03-17 | 上海派能能源科技股份有限公司 | Battery pack short-circuit protection circuit device and method |
-
2014
- 2014-12-11 CN CN201420773686.3U patent/CN204271621U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018090924A1 (en) * | 2016-11-18 | 2018-05-24 | 深圳创维数字技术有限公司 | Over-voltage and reverse connection protection circuit and device thereof |
| CN109638903A (en) * | 2018-11-29 | 2019-04-16 | 北斗天地股份有限公司山东分公司 | A kind of battery and its protection circuit, intrinsic safety type smart phone |
| CN110890744A (en) * | 2019-12-26 | 2020-03-17 | 上海派能能源科技股份有限公司 | Battery pack short-circuit protection circuit device and method |
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| 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: 20150415 Termination date: 20181211 |
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| CF01 | Termination of patent right due to non-payment of annual fee |