CN103022581B - A kind of protective circuit and control method, device - Google Patents
A kind of protective circuit and control method, device Download PDFInfo
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- CN103022581B CN103022581B CN201210389129.7A CN201210389129A CN103022581B CN 103022581 B CN103022581 B CN 103022581B CN 201210389129 A CN201210389129 A CN 201210389129A CN 103022581 B CN103022581 B CN 103022581B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of protective circuit and control method, device, for avoiding the voltage disturbance of battery when loading battery compartment on the impact of electronic device function, and improving the security performance of battery.This control circuit comprises the first switch, second switch, the first resistance and delay circuit, when power brick enters using state, closed first switch, the electric current that battery core is exported is after delay circuit, after the delay time through presetting, the grid of second switch enters closure state, the positive pole of battery core and the positive pole conducting of power brick after obtaining and entering the critical voltage of closure state, thus avoids voltage disturbance that battery occurs when loading battery compartment to the impact of electronic device function; When power brick departs from using state, turn off the first switch, the voltage at the grid place of second switch be down to enter closure state critical voltage under enter off state, the switch off current that the positive pole of battery core exports, thus improve security performance when battery does not load battery compartment.
Description
Technical field
The present invention relates to electronic applications, particularly relate to a kind of protective circuit and control method, device.
Background technology
In recent years, universal along with products such as such as mobile phone, mobile computer, Video Camera, electric motor cars, the secondary cell with charge function extensive use as a kind of energy supply device.At present, common on market secondary cell mainly can be divided into nickel-cadmium cell, Ni-MH battery, lithium ion battery.
In actual applications, the battery that electronic equipment uses also can be called power brick (battery pack), hard contact in power brick is the positive pole (Pack+) of power brick and the negative pole (Pack-) of power brick, wherein, power brick generates the further packaging of battery core to obtain, battery core is responsible for providing electric current, and the positive pole (Pack+) of power brick is connected with the positive pole (Cell+) of battery core, and the negative pole (Pack-) of power brick is connected with the negative pole (Cell-) of battery core.
In prior art, power brick is at the certain voltage of the Shi Douyou that dispatches from the factory, therefore, when power brick being inserted the battery compartment of electronic equipment, because the battery connector in battery compartment has elastic nature, cell voltage generation disturbance can be caused, thus affect the stability of device in electronic equipment, easily cause the malfunction of some electronic devices and components of electronic equipment, even lost efficacy, and then damage, such as, the client identification module (SubscriberIdentity Module, SIM) of mobile terminal easily damages when being stuck in spread of voltage, causes user to lose.Meanwhile, have voltage between the positive and negative electrode due to power brick, easily conducting occur, cause for battery transport and to carry requirement harsher.
Summary of the invention
The embodiment of the present invention provides a kind of protective circuit and control method, device; can in order to the voltage disturbance avoiding battery to occur when loading battery compartment; with the impact of voltage disturbance on electronic devices and components function, and preventing battery to meet accident when not loading battery compartment conducting, improving security performance.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
A kind of protective circuit, described protective circuit comprises: the first switch, second switch, the first resistance and delay circuit;
Wherein, described one end of first switch is connected with the positive pole of battery core, and the other end of described first switch is connected with delay circuit, and described first switch is for the conducting of electric current that controls described battery core and export to described delay circuit and shutoff;
The source electrode of described second switch is connected with the positive pole of described battery core, the grid of described second switch is connected with one end of described delay circuit, described first resistance, the drain electrode of described second switch is the positive pole of power brick, and described second switch is for controlling conducting and the shutoff of described power brick output current;
One end of described first resistance is connected with the grid of described second switch, and the other end of described first resistance is connected with the negative pole of the negative pole of described battery core, described power brick, and described first resistance connects state for preventing the grid of described second switch to be in sky;
Between the other end that described delay circuit is connected to described first switch and the grid of described second switch, for making described second switch timing closing.
A control method for protective circuit, described method comprises:
When power brick enters using state, closed first switch, the electric current that battery core is exported flows into the grid of second switch through delay circuit, and after the delay time through described delay circuit, the grid of second switch obtains and makes described second switch enter the critical voltage of closure state, the source electrode of described second switch and drain electrode conducting, with the positive pole conducting of described power brick making the positive pole of the described battery core be connected with the source electrode of described second switch, be connected with the drain electrode of described second switch;
When power brick departs from using state, turn off described first switch, the voltage of the grid of described second switch is down under described critical voltage, source electrode and the drain electrode of described second switch enter off state, and to make the positive pole of the described battery core be connected with the source electrode of described second switch, the positive pole of described power brick that is connected with the drain electrode of described second switch turns off.
A control device for protective circuit, described device comprises:
First control unit, for when power brick enters using state, closed first switch, the electric current that battery core is exported flows into the grid of second switch through delay circuit, and after the delay time through described delay circuit, the grid of second switch obtains and makes described second switch enter the critical voltage of closure state, the source electrode of described second switch and drain electrode conducting, with the positive pole conducting of described power brick making the positive pole of the described battery core be connected with the source electrode of described second switch, be connected with the drain electrode of described second switch;
Second control unit, for when power brick departs from using state, turn off described first switch, the voltage of the grid of described second switch is down under described critical voltage, source electrode and the drain electrode of described second switch enter off state, and to make the positive pole of the described battery core be connected with the source electrode of described second switch, the positive pole of described power brick that is connected with the drain electrode of described second switch turns off.
Embodiments provide a kind of protective circuit and control method, device, wherein, protective circuit comprises: the first switch, second switch, the first resistance and delay circuit, simultaneously, the annexation of each device is specially: one end of the first switch is connected with the positive pole Cell+ of battery core, and the other end is connected with delay circuit; The source electrode of second switch is connected with the positive pole Cell+ of battery core, and grid is connected with one end of delay circuit, the first resistance, drains as the positive pole Pack+ of power brick; The other end of the first resistance is connected with the negative pole Pack-of the negative pole Cell-of battery core, power brick; Delay circuit is connected between the grid of the other end of the first switch, second switch.When power brick enters using state, closed first switch, the electric current that battery core is exported is after delay circuit, after the delay time through presetting, the grid of second switch obtains and makes second switch enter the critical voltage of closure state, the source electrode of second switch and drain electrode conducting, to make the positive pole Cell+ of the battery core be connected with the source electrode of second switch, the positive pole Pack+ conducting of the power brick be connected with the drain electrode of second switch, the positive pole Cell+ of battery core is by second switch output current, avoid the voltage disturbance that battery occurs when loading battery compartment, with the impact of voltage disturbance on electronic devices and components function, when making power brick depart from using state, turn off the first switch, and then the voltage at the grid place of second switch be down to enter closure state critical voltage under, source electrode and the drain electrode of second switch enter off state, battery core positive pole Cell+ export switch off current, thus prevent battery to meet accident when not loading battery compartment the transmitting of conducting, improve the security performance of battery.
Accompanying drawing explanation
Fig. 1 is the structural representation of protective circuit in the embodiment of the present invention;
Fig. 2 is the schematic diagram of second switch in the embodiment of the present invention;
Fig. 3 is the detailed construction schematic diagram of protective circuit in the embodiment of the present invention.
Embodiment
In order to avoid the voltage disturbance that battery occurs when loading battery compartment; with the impact of voltage disturbance on electronic devices and components function; and prevent battery to meet accident when not loading battery compartment conducting, improve security performance, embodiments provide a kind of protective circuit and control method, device.Below in conjunction with Figure of description, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.And when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is described in detail.
The protective circuit that the embodiment of the present invention provides as shown in Figure 1, comprising:
First interrupteur SW 1, second switch SW2, the first resistance R1 and delay circuit RC.Wherein, the annexation of each device is specially:
One end of first interrupteur SW 1 is connected with the positive pole Cell+ of battery core, and the other end of the first interrupteur SW 1 is connected with delay circuit RC, and the first interrupteur SW 1 is for the conducting of electric current that controls battery core and export to delay circuit RC and shutoff;
The source electrode of second switch SW2 is connected with the positive pole Cell+ of battery core, the grid of second switch SW2 is connected with one end of delay circuit RC, the first resistance R1, the drain electrode of second switch SW2 is the positive pole Pack+ of power brick, and second switch SW2 is for controlling conducting and the shutoff of described power brick output current;
One end of first resistance R1 is connected with the grid of second switch SW2, and the other end of the first resistance R1 is connected with the negative pole Pack-of the negative pole Cell-of battery core, power brick, and the first resistance R1 connects state for preventing the grid of second switch SW2 to be in sky;
Delay circuit RC is connected between the grid of the other end of the first interrupteur SW 1, second switch SW2, for making second switch SW2 timing closing.
In actual applications, the first interrupteur SW 1 is position switch: also known as limit switch, is a kind of conventional small area analysis master control electrical apparatus, for realizing the detection of sequential control, positioning control or location status, has been widely used in a lot of field.First interrupteur SW 1 is divided into mechanical switch and electric induction type switch, wherein, mechanical switch utilizes the collision of manufacturing machine moving component to make its contact action to realize to connect or disjunction control circuit, reach certain control object, usually, this kind of switch is used to position or the stroke of limit mechanical motion, make that movable machinery stops automatically by certain position or stroke, counter motion, variable motion or back and forth movement etc. automatically; Electric induction type proximity switch, also known as non-contact travel switch, divides by operation principle, and mainly contain high-frequency oscillation type, Hall-type, ultrasonic type, condenser type, differential lines ring type, magneto etc., wherein, high-frequency oscillation type is the most conventional.
Such as, when the first interrupteur SW 1 uses Hall-type switch, be implemented as follows:
In battery compartment, install the magnet of answering with Hall-type Switch Controller, when power brick is close to battery compartment, the first interrupteur SW 1 enters the induction range of magnet, and due to magnetic field effect, the first switch closes.
In embodiments of the present invention; consult shown in Fig. 2; second switch SW2 is N-type metal-oxide half field effect transistor; it should be noted that; for the transistor in protective circuit field; drain electrode and source electrode do not have clear and definite difference, and the source electrode of the transistor therefore mentioned in the embodiment of the present invention can be the drain electrode of transistor, and the drain electrode of transistor also can be the source electrode of transistor.That is, in embodiments of the present invention, the source electrode of transistor and the connected mode of drain electrode can be exchanged, and namely the source electrode of transistor also can be connected with the positive pole Pack+ of power brick, drain to be connected with the positive pole Cell+ of battery core.
Delay circuit RC has been widely used in a lot of field, wherein, delay circuit RC is the resistance R that connects on electric capacity C, when battery core is charged to electric capacity C, resistance R serves the effect of a current limliting, wherein, the resistance of resistance R and the capacity of electric capacity C larger, the time of charging is longer, and the time of time delay is exactly this charging process.
Consult shown in Fig. 3, in embodiments of the present invention, delay circuit RC comprises: the second resistance R2 and the first electric capacity C1;
Wherein, one end of the second resistance R2 is connected with the other end of the first interrupteur SW 1, and the other end of the second resistance R2 is connected with the grid of second switch SW2;
One end of first electric capacity C1 is connected with the other end of the second resistance R2, the grid of second switch SW2, and the other end of the first electric capacity C1 is connected with the other end of the first resistance R1, the negative pole Pack-of power brick.
When battery core charges to the first electric capacity C1, second resistance R2 serves the effect of a current limliting, namely the time that the first electric capacity C1 charges is increased, when the resistance of the second resistance R2 and the capacity of the first electric capacity C1 larger, the time of the first electric capacity C1 voltage rise is slower, and then first time of reaching needed for certain value of electric capacity C1 voltage longer, time of time delay, to be exactly battery core be charged to voltage to the first electric capacity C1 reaches time needed for certain value, the delay time computing formula of delay circuit RC:
Delay time=-* C1n [(E-V)/E] (formula one)
Wherein, "-" is negative sign; R is the resistance of the second resistance R2; C is the capacity of the first electric capacity C1; E is the voltage at delay circuit RC two ends; V is the magnitude of voltage that the first electric capacity C1 will reach.
Such as: the resistance R of the second resistance R2 is 150K, the capacity of the first electric capacity C1 is 46UF, and the voltage E at delay circuit RC two ends is 12V, and the magnitude of voltage 0V that the first electric capacity C1 will reach is 3V, then the delay time of delay circuit RC is 2S according to formula one result of calculation.
In actual applications, resistance can be divided into fixed resistance, adjustable resistance, special resistance (sensitive resistance) according to resistance characteristic, and resistance can not regulate, and we are referred to as fixed value resistance or fixed resistance, and can regulate, we are referred to as adjustable resistance.In embodiments of the present invention, the first resistance R1 and the second resistance R2 can be both fixed resistance simultaneously, can be also adjustable resistance simultaneously, can also be special resistance simultaneously; Or the first resistance R1 adopts the resistance of different resistance characteristic from the second resistance R2, e.g., the first resistance R1 adopts fixed resistance, and the second resistance R2 adopts adjustable resistance, or the first resistance R1 adopts special resistance, and the second resistance R2 adopts fixed resistance.
Preferably, in order to control the voltage that power brick positive pole Pack+ exports more easily, the delay time of the delay circuit that the second resistance R2 and the first electric capacity C1 is formed regulates with reference to formula one.
In order to further illustrate the protective circuit that the embodiment of the present invention provides, illustrate operation principle below.
In embodiments of the present invention, when power brick enters using state, that is, when power brick being put into the battery compartment of electronic equipment, first interrupteur SW 1 is by induction, closure state is become from off-state, after first interrupteur SW 1 is closed, the circuit that delay circuit RC and battery core form is closure state, battery core is charged to the first electric capacity C1, the electric current that battery core is exported flows into the grid of second switch SW2 through delay circuit RC, after the delay time preset of delay circuit RC, that is, after the first electric capacity C1 charges certain hour, when the electricity of the first electric capacity C1 reaches certain value, the grid of second switch SW2 obtains and makes second switch SW2 enter the critical voltage of closure state, the source electrode of second switch SW2 and drain electrode conducting, the positive pole Cell+ of the battery core be connected with the source electrode of second switch SW2, the positive pole Pack+ conducting of the power brick be connected with the drain electrode of second switch SW2, the positive pole Cell+ of battery core is by second switch SW2 output current.
In embodiments of the present invention, when power brick departs from using state, turn off the first interrupteur SW 1, therefore, the first electric capacity C1 charges.Second switch SW2 in the embodiment of the present invention is N-type transistor, the feature of N-type transistor is, when the electrical potential difference that the electromotive force of electrical potential difference or grid that the electromotive force of grid deducts the electromotive force of source electrode deducts the electromotive force of drain electrode reaches default threshold value, transistor is conducting state, otherwise be off state, therefore, if when the first electric capacity C1 capacity charges, then the current potential of the grid of transistor is electronegative potential, that is, the voltage at the grid place of second switch SW2 be down to enter closure state critical voltage under, source electrode and the drain electrode of second switch SW2 enter off state, the positive pole Cell+ of the battery core of the source electrode connection of second switch SW2, the positive pole Pack+ of the power brick be connected with the drain electrode of second switch SW2 turns off, that is, the switch off current of the positive pole Cell+ output of battery core, thus prevent battery to meet accident when not loading battery compartment conducting, improve the security performance of battery when not loading the battery compartment of mobile device (such as, the security performance of battery in transportation).
In embodiments of the present invention, closed or before turning off the first interrupteur SW 1, also by the capacity setting delay time of the resistance and the first electric capacity C1 that arrange the second resistance R2.
In the embodiment of the present invention, before closing or turning off the first interrupteur SW 1, the state detecting power brick still departs from using state for entering using state, wherein, the state of power brick can be detected in the following way: whether the distance detecting power brick and battery compartment reaches predeterminable range, if so, then think that power brick is for entering using state; Otherwise, think that power brick departs from using state.
The embodiment of the present invention also provides a kind of control device of protective circuit, comprising:
First control unit, for for when power brick enters using state, closed first switch, the electric current that battery core is exported flows into the grid of second switch through delay circuit, and after the delay time of delay circuit, the grid of second switch obtains and makes second switch enter the critical voltage of closure state, the source electrode of second switch and drain electrode conducting, with the positive pole conducting of power brick making the positive pole of the battery core be connected with the source electrode of second switch, be connected with the drain electrode of second switch;
Second control unit, for when power brick departs from using state, turn off the first switch, the voltage of the grid of second switch is down under critical voltage, source electrode and the drain electrode of second switch enter off state, and to make the positive pole of the battery core be connected with the source electrode of second switch, the positive pole of power brick that is connected with the drain electrode of second switch turns off.
In sum, embodiments provide a kind of protective circuit and control method, device, wherein, protective circuit comprises: the first switch, second switch, the first resistance and delay circuit, simultaneously, the annexation of each device is specially: one end of the first switch is connected with the positive pole Cell+ of battery core, and the other end is connected with delay circuit; The source electrode of second switch is connected with the positive pole Cell+ of battery core, and grid is connected with one end of delay circuit, the first resistance, drains as the positive pole Pack+ of power brick; The other end of the first resistance is connected with the negative pole Pack-of the negative pole Cell-of battery core, power brick; Delay circuit is connected between the grid of the other end of the first switch, second switch.When power brick enters using state, closed first switch, the electric current that battery core is exported is after delay circuit, after the delay time through presetting, the grid of second switch obtains and makes second switch enter the critical voltage of closure state, the source electrode of second switch and drain electrode conducting, to make the positive pole Cell+ of the battery core be connected with the source electrode of second switch, the positive pole Pack+ conducting of the power brick be connected with the drain electrode of second switch, the positive pole Cell+ of battery core is by second switch output current, avoid the voltage disturbance that battery occurs when loading battery compartment, with the impact of voltage disturbance on electronic devices and components function, when making power brick depart from using state, turn off the first switch, and then the voltage at the grid place of second switch be down to enter closure state critical voltage under, source electrode and the drain electrode of second switch enter off state, battery core positive pole Cell+ export switch off current, thus prevent battery to meet accident when not loading battery compartment the transmitting of conducting, improve the security performance of battery.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the embodiment of the present invention and not depart from the spirit and scope of the embodiment of the present invention.Like this, if these amendments of the embodiment of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (11)
1. a protective circuit, is characterized in that, described protective circuit comprises: the first switch, second switch, the first resistance and delay circuit;
Wherein, described one end of first switch is connected with the positive pole of battery core, and the other end of described first switch is connected with delay circuit, and described first switch is for the conducting of electric current that controls described battery core and export to described delay circuit and shutoff;
The source electrode of described second switch is connected with the positive pole of described battery core, the grid of described second switch is connected with one end of described delay circuit, described first resistance, the drain electrode of described second switch is the positive pole of power brick, and described second switch is for controlling conducting and the shutoff of described power brick output current;
One end of described first resistance is connected with the grid of described second switch, and the other end of described first resistance is connected with the negative pole of the negative pole of described battery core, described power brick, and described first resistance connects state for preventing the grid of described second switch to be in sky;
Between the other end that described delay circuit is connected to described first switch and the grid of described second switch, for making described second switch timing closing;
Wherein, described delay circuit comprises: the second resistance and the first electric capacity;
Wherein, one end of described second resistance is connected with the other end of described first switch, and the other end of described second resistance is connected with the grid of described second switch;
One end of described first electric capacity is connected with the other end of described second resistance, the grid of described second switch, and the other end of described first electric capacity is connected with the other end of described first resistance, the negative pole of described power brick.
2. protective circuit as claimed in claim 1, it is characterized in that, described second switch is N-type metal-oxide half field effect transistor.
3. protective circuit as claimed in claim 1 or 2, it is characterized in that, described first switch is the position switch of mechanical position switch or electric induction type.
4. a control method for protective circuit, described protective circuit comprises the first switch, second switch, the first resistance and delay circuit, it is characterized in that, described method comprises:
When power brick enters using state, closed first switch, the electric current that battery core is exported flows into the grid of second switch through delay circuit, and after the delay time through described delay circuit, the grid of second switch obtains and makes described second switch enter the critical voltage of closure state, the source electrode of described second switch and drain electrode conducting, with the positive pole conducting of described power brick making the positive pole of the described battery core be connected with the source electrode of described second switch, be connected with the drain electrode of described second switch;
When power brick departs from using state, turn off described first switch, the voltage of the grid of described second switch is down under described critical voltage, source electrode and the drain electrode of described second switch enter off state, and to make the positive pole of the described battery core be connected with the source electrode of described second switch, the positive pole of described power brick that is connected with the drain electrode of described second switch turns off.
5. method as claimed in claim 4, is characterized in that, described closed or before turning off described first switch, also comprises:
By delay time described in the capacity setting of the resistance and the first electric capacity that arrange the second resistance;
Wherein, described delay circuit comprises: the second resistance and the first electric capacity;
Wherein, one end of described second resistance is connected with the other end of described first switch, and the other end of described second resistance is connected with the grid of described second switch;
One end of described first electric capacity is connected with the other end of described second resistance, the grid of described second switch, and the other end of described first electric capacity is connected with the other end of described first resistance, the negative pole of described power brick.
6. method as claimed in claim 4, is characterized in that, described closed or before turning off described first switch, also comprises:
Detect the state of described power brick;
Wherein, the state of described power brick comprise enter using state and depart from using state.
7. method as claimed in claim 6, it is characterized in that, the state of the described power brick of described detection, comprising:
Whether the distance detecting described power brick and battery compartment reaches predeterminable range;
When reaching predeterminable range, then described power brick is for entering using state;
When not reaching predeterminable range, then described power brick departs from using state.
8. a control device for protective circuit, described protective circuit comprises the first switch, second switch, the first resistance and delay circuit, it is characterized in that, described device comprises:
First control unit, for when power brick enters using state, closed first switch, the electric current that battery core is exported flows into the grid of second switch through delay circuit, and after the delay time through described delay circuit, the grid of second switch obtains and makes described second switch enter the critical voltage of closure state, the source electrode of described second switch and drain electrode conducting, with the positive pole conducting of described power brick making the positive pole of the described battery core be connected with the source electrode of described second switch, be connected with the drain electrode of described second switch;
Second control unit, for when power brick departs from using state, turn off described first switch, the voltage of the grid of described second switch is down under described critical voltage, source electrode and the drain electrode of described second switch enter off state, and to make the positive pole of the described battery core be connected with the source electrode of described second switch, the positive pole of described power brick that is connected with the drain electrode of described second switch turns off.
9. device as claimed in claim 8, is characterized in that, described first control unit also for, before closed described first switch, by delay time described in the capacity setting of the resistance and the first electric capacity that arrange the second resistance; Described second control unit also for, before described first switch of shutoff, by delay time described in the capacity setting of the resistance and the first electric capacity that arrange the second resistance;
Wherein, described delay circuit comprises: the second resistance and the first electric capacity;
Wherein, one end of described second resistance is connected with the other end of described first switch, and the other end of described second resistance is connected with the grid of described second switch;
One end of described first electric capacity is connected with the other end of described second resistance, the grid of described second switch, and the other end of described first electric capacity is connected with the other end of described first resistance, the negative pole of described power brick.
10. device as claimed in claim 8, is characterized in that, described first control unit also for: before closed described first switch, the state detecting described power brick enters using state; Described second control unit also for: shutoff described first switch before, detect described power brick state depart from using state.
11. devices as claimed in claim 10, is characterized in that, described first control unit and described second control unit also for:
Detect the state of described power brick in the following way:
Whether the distance detecting described power brick and battery compartment reaches predeterminable range, and when reaching predeterminable range, then described power brick is for entering using state; When not reaching predeterminable range, then described power brick departs from using state.
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| CN108539817A (en) * | 2016-08-26 | 2018-09-14 | 常州爱上学教育科技有限公司 | Avoid the battery automatic protective system and its working method of short circuit |
| CN106602155B (en) * | 2016-12-19 | 2024-03-15 | 珠海格力电器股份有限公司 | Battery cell |
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|---|---|---|---|---|
| CN101267122A (en) * | 2008-01-02 | 2008-09-17 | 何岳明 | Charging and discharging protection circuit for multiple serial lithium battery |
| CN101741121A (en) * | 2009-12-30 | 2010-06-16 | 上海德朗能电池有限公司 | Electronic switch arranged on lithium battery pack protecting board |
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| Publication number | Publication date |
|---|---|
| CN103022581A (en) | 2013-04-03 |
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