CN101916983A - Battery protection circuit and portable light - Google Patents

Abstract

The invention relates to a batter protection circuit which comprises a voltage detection unit, a current direction unit, a control unit and an execution unit. The voltage detection unit detects the output voltages of all battery cells connected in series in a batter; the current detection unit detects the output current of the battery; the control unit sends a disconnection control signal when the output voltage of any battery cell exceeds a preset voltage threshold value range or the output current is larger than a preset current threshold value; and the execution unit disconnects the power supply loop of the batter after receiving the disconnection control signal, thereby preventing the over-discharging, overcharging and overcurrent of the battery, avoiding the influence on the performance and service life of the battery, as well as safety problems, such as explosion.

Description

Battery protecting circuit and portable lamp

Technical field

The present invention relates to lighting technical field, more particularly, relate to a kind of battery protecting circuit and use the portable lamp of this circuit.

Background technology

At present, portable lamp generally all adopts secondary cell (rechargeable battery) power supply, and this secondary cell generally all is made of a plurality of electric cores series connection, and in normal use, inside battery carries out the chemical positive reaction that electric energy and chemical energy transform mutually.

But; existing portable lamp does not generally possess the battery protection function, and battery will cause inside battery generation chemical side reactions if took place to put, overcharge and over-current phenomenon avoidance; thereby influence the performance and the useful life of battery, even set off an explosion and cause safety problem.

Summary of the invention

The technical problem to be solved in the present invention is; thereby the above-mentioned portable lamp at prior art does not possess performance and the useful life that the battery protection function influences battery; even can set off an explosion and cause the defective of safety problem, a kind of battery protecting circuit is provided and uses the portable lamp of this circuit.

One of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of battery protecting circuit, comprising:

Voltage detection unit: the output voltage to each electric core of connecting in the battery detects;

Current detecting unit: the output current to battery detects;

Control unit: when the output voltage of any one electric core exceeds predefined voltage threshold scope or described output current greater than predefined current threshold, send the disconnection control signal;

Performance element: the current supply circuit that when receiving described disconnection control signal, disconnects battery.

In the battery protecting circuit of the present invention, also comprise:

The unit is set: the delay time that described control unit is sent described disconnection control signal is provided with.

In the battery protecting circuit of the present invention, described control unit adopts the battery protection chip, and described battery protection chip comprises:

Power end: the voltage that is used to import anode;

Input: comprise a plurality ofly, import the positive pole of each electric core, the voltage of negative pole respectively;

Discharge control end: be used to export described disconnection control signal;

Time-delay is provided with end: be used to be provided with the delay time that sends described disconnection control signal;

Select switch terminal: the quantity of just selecting the electric core of connecting in the battery according to the level of this port;

Negative supply voltage test side: be used to import the changing voltage that the output current of described battery is converted to;

Earth terminal.

In the battery protecting circuit of the present invention, described performance element is connected between the positive pole and load of battery, is subjected to described discharge control end to control its disconnection or conducting.

In the battery protecting circuit of the present invention, described performance element comprises first switching tube, and its source electrode is connected to anode, and its drain electrode is connected to load, and its grid is connected to described discharge control end.

In the battery protecting circuit of the present invention; described performance element comprises the second switch pipe and the 3rd switching tube of belt body diode; the source electrode of the 3rd switching tube is connected to anode; the drain electrode of the 3rd switching tube is connected to the drain electrode of second switch pipe; the source electrode of second switch pipe is connected to load; the body diode forward of second switch pipe is connected between the drain electrode and source electrode of second switch pipe; the body diode forward of the 3rd switching tube is connected between the drain electrode and source electrode of the 3rd switching tube; the grid of the 3rd switching tube is connected to described discharge control end, and the grid of second switch pipe also is subjected to described battery protection chip controls.

In the battery protecting circuit of the present invention, the electric core of series connection is 4 in the described battery, and accordingly, described selection switch terminal is a high level;

The electric core of series connection is 3 in the described battery, and accordingly, described selection switch terminal is a low level.

In the battery protecting circuit of the present invention, described detecting unit comprises the protective resistance that is connected to a plurality of inputs and earth terminal and is connected to filter capacitor between a plurality of inputs and the power end.

In the battery protecting circuit of the present invention, the electric core of series connection is 4 in the described battery, described anode is the positive pole of the first electric core, the negative pole of the first electric core links to each other with the positive pole of the second electric core, the negative pole of the second electric core links to each other with the positive pole of the 3rd electric core, the negative pole of the 3rd electric core links to each other with the positive pole of the 4th electric core, and battery cathode is the negative pole of the 4th electric core;

Described battery protecting circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity and the 7th electric capacity;

Described power end is connected to anode;

Described earth terminal is connected to anode by the 5th electric capacity, is connected to battery cathode by the 9th resistance simultaneously;

By the 12 resistance, the 17 grounding through resistance, the node of the 12 resistance and the 17 resistance is received power end by the 18 resistance to described selection switch terminal successively;

Described discharge control end is connected to the grid of the 3rd switching tube by the 3rd resistance;

Described negative supply voltage test side is successively by the 7th resistance and the 13 grounding through resistance, the node of the 7th resistance and the 13 resistance is also by the 15 grounding through resistance, the node of the 7th resistance and the 13 resistance is received battery cathode by the 14 resistance again, and battery cathode is by the tenth grounding through resistance;

Described time-delay is provided with end and comprised putting and detect time-delay and end is set and overcharges and detect time-delay end is set, cross to put and detect time-delay and end is set is used to be arranged on battery and crosses the delay time of putting, sending described disconnection control signal during overcurrent, promptly be connected to earth terminal by the 7th electric capacity; Overcharge the detection time-delay end sends described disconnection control signal when being used to be arranged on over-charging of battery delay time is set, promptly be connected to earth terminal by the 6th electric capacity;

Described input comprises:

First input end is used to import the voltage of the first electric core positive pole, promptly is connected to anode by the 4th resistance, is connected to power end by first electric capacity simultaneously;

Second input is used to import the voltages at nodes of the first electric core negative pole and the second electric core positive pole, promptly is connected to the first electric core negative pole by the 5th resistance, is connected to power end by the 3rd electric capacity simultaneously;

The 3rd input is used to import the voltages at nodes of the second electric core negative pole and the 3rd electric core positive pole, promptly is connected to the second electric core negative pole by the 6th resistance, is connected to power end by second electric capacity simultaneously;

Four-input terminal is used to import the voltages at nodes of the 3rd electric core negative pole and the 4th electric core positive pole, promptly is connected to the 3rd electric core negative pole by the 11 resistance, is connected to power end by the 4th electric capacity simultaneously; Four-input terminal is also by the 16 grounding through resistance;

Described battery protection chip also comprises:

The charging control end, the grid of connection second switch pipe, the grid of second switch pipe links to each other by second resistance with source electrode;

The charge and discharge switch control end is connected to earth terminal by the 8th resistance;

The positive voltage test side is connected to load by first resistance;

Battery cathode is by the tenth grounding through resistance.

Two of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of portable lamp, comprise battery protecting circuit, described battery protecting circuit adopts the battery protecting circuit described in one of technique scheme.

Implement battery protecting circuit of the present invention and use the portable lamp of this circuit; have following beneficial effect: voltage detection unit detects and obtains output voltage to the output voltage of each electric core of connecting in the battery; current detecting unit detects and obtains output current to the output current of battery; when control unit exceeds predefined voltage threshold scope or described output current greater than predefined current threshold at the output voltage of any one electric core; send the disconnection control signal; performance element disconnects the current supply circuit of battery when receiving described disconnection control signal; prevent that battery from taking place to put; overcharge and over-current phenomenon avoidance; thereby avoid influencing the performance and the useful life of battery, even set off an explosion and cause safety problem.

Description of drawings

The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:

Fig. 1 is the structured flowchart of battery protecting circuit first embodiment of the present invention;

Fig. 2 is the structured flowchart of battery protecting circuit second embodiment of the present invention;

Fig. 3 is the circuit diagram of first embodiment of performance element among the present invention;

Fig. 4 is the circuit diagram of second embodiment of performance element among the present invention;

Fig. 5 is the circuit diagram of battery protecting circuit of the present invention shown in Figure 2.

Embodiment

As shown in Figure 1, be the structured flowchart of battery protecting circuit first embodiment of the present invention.Battery protecting circuit of the present invention comprisesvoltage detection unit 100, current detectingunit 200,control unit 300 and performance element 400.Wherein, the output voltage of each electric core of series connection detects in 100 pairs of batteries ofvoltage detection unit 600; The output current of 200 pairs of batteries of current detecting unit detects; Whencontrol unit 300 exceeds predefined voltage threshold scope or described output current greater than predefined current threshold at the output voltage of any one electric core, send the disconnection control signal;Performance element 400 disconnects the current supply circuit ofbattery 600 when receiving described disconnection control signal, thereby prevent thatbattery 600 from taking place to put, overcharging and over-current phenomenon avoidance, avoiding influencing the performance and the useful life ofbattery 600, even set off an explosion and cause safety problem.

Above-mentioned describedbattery 600,voltage detection unit 100,control unit 300 andperformance element 400 link to each other successively, and described current detectingunit 200 also links to each other withcontrol unit 300 withbattery 600, and describedperformance element 400 also links to each other withbattery 600.

As shown in Figure 2, be the structured flowchart of battery protecting circuit second embodiment of the present invention.The difference of second embodiment and first embodiment shown in Figure 1 is: on the basis of first embodiment; battery protecting circuit also comprisesunit 500 is set;unit 500 is set to link to each other withcontrol unit 300; the delay time thatcontrol unit 300 is sent described disconnection control signal is provided with; cross atbattery 600 and to put, to overcharge or during overcurrent; can not disconnectbattery 600 immediately; can postpone to disconnect again behind the certain hour; for the user reserves some times; after 10 seconds; in this time period, also can start an indicating device user is pointed out.

As shown in Figure 3, be the circuit diagram of first embodiment ofperformance element 400 among the presentinvention.Performance element 400 is connected between the positive pole and load of battery; and controlledunit 300 its disconnection of control or conductings; whenperformance element 400 conductings; battery regular picture; whenperformance element 400 disconnects; the current supply circuit of battery disconnects, and can prevent that battery from taking place to put, overcharging and over-current phenomenon avoidance, shields to battery.

In the present embodiment,performance element 400 comprises the first switching tube Q1, its source electrode is connected to anode, its drain electrode is connected to load, its grid is connected to a control end ofcontrol unit 300, when being low level on this control end, and the first switching tube Q1 conducting, the current supply circuit conducting of battery, the load operate as normal; When being high level on this control end, the first switching tube Q1 disconnects, and the current supply circuit of battery disconnects, and load is not worked.

As shown in Figure 4, be the circuit diagram of second embodiment ofperformance element 400 among the present invention.In the present embodiment,performance element 400 comprises the second switch pipe Q2 and the 3rd switching tube Q3 of belt body diode, the source electrode of the 3rd switching tube Q3 is connected to anode, the drain electrode of the 3rd switching tube Q3 is connected to the drain electrode of second switch pipe Q2, the source electrode of second switch pipe Q2 is connected to load, the body diode forward of second switch pipe Q2 is connected between the drain electrode and source electrode of second switch pipe Q2, the body diode forward of the 3rd switching tube Q3 is connected between the drain electrode and source electrode of the 3rd switching tube Q3, the grid of the 3rd switching tube Q3 is connected to a control end of control unit, and the grid of second switch pipe Q2 is connected to another control end of control unit.

When second switch pipe Q2 disconnection, the 3rd switching tube Q3 conducting, battery can be an electric by the body diode of the 3rd switching tube Q3, second switch pipe Q2; When second switch pipe Q2 conducting, the 3rd switching tube Q3 disconnect, can insert charger at the source electrode of the 3rd switching tube Q3, the body diode of charger by second switch pipe Q2, the 3rd switching tube Q3 is to battery charge.As seen, in thisexecutive circuit 300, be in series and the second switch pipe Q2 and the 3rd switching tube Q3 of belt body diode, both can realize discharging function, can realize charge function again by employing.

As shown in Figure 5, be the circuit diagram of battery protecting circuit of the present invention shown in Figure 2.In this circuit,control unit 300 adopts battery protection chip U1, and its preferred model is S8254.Chip S8254 is a kind of be applicable to 3 or 4 electric core series connected battery protection chips, and its pin assignment and functional definition are as shown in table 1.

In this circuit diagram,battery 600 is made of four electric core series connection, be described for example with " anode is the positive pole of the first electric core; the negative pole of the first electric core links to each other with the positive pole of the second electric core; the negative pole of the second electric core links to each other with the positive pole of the 3rd electric core; the negative pole of the 3rd electric core links to each other with the positive pole of the 4th electric core; battery cathode is the negative pole of the 4th electric core ", herein, the definition anode is B+, and battery cathode is B-, and the node of the positive pole of the negative pole of the first electric core and the second electric core is BM3, the node of the positive pole of the negative pole of the second electric core and the 3rd electric core is BM2, and the node of the positive pole of the negative pole of the 3rd electric core and the 4th electric core is BM1.In addition, be electric by the P+ end.

Table 1

Performance element 400 adopts the circuit of second embodiment among Fig. 4, andperformance element 400 comprises the second switch pipe Q2 and the 3rd switching tube Q3 of belt body diode, and the body diode of second switch pipe Q2 and the 3rd switching tube Q3 is not shown in Fig. 5.The source electrode of the 3rd switching tube Q3 is connected to anode B+, the drain electrode of the 3rd switching tube Q3 is connected to the drain electrode of second switch pipe Q2, the source electrode of second switch pipe Q2 is connected to load, the body diode forward of second switch pipe Q2 is connected between the drain electrode and source electrode of second switch pipe Q2, the body diode forward of the 3rd switching tube Q3 is connected between the drain electrode and source electrode of the 3rd switching tube Q3, all controlledunit 300 controls of the grid of second switch pipe Q2 and the 3rd switching tube Q3.

In this circuit, because being connected by four electric cores,battery 600 constitutes, so the selection switch terminal SEL (pin 11) of chip S8254 needs to keep high level.Below describe in detail:

For chip S8254:

Its power end VDD (pin 16) is used to import the cathode voltage ofbattery 600, promptly is connected to anode B+;

Its earth terminal VSS (pin 7) is connected to anode B+ by the 5th capacitor C 5, is connected to battery cathode B-by the 9th resistance R 9 simultaneously;

It selects switch terminal SEL (pin 10) just to switch the quantity of the electric core that series connection is set according to level, promptly successively by the 12 resistance R the 12, the 17 resistance R 17 ground connection, the node of the 12 resistance R 12 and the 17 resistance R 17 is received power end VDD (pin 16) by the 18 resistance R 18;

Its discharge control end DOP (pin 3) is used for output and disconnects control signal, promptly is connected to the grid of the 3rd switching tube Q3 by the 3rd resistance R 3;

It is crossed to put and detects time-delay and end CDT (pin 5) is set is used to be arranged on battery and crosses the delay time of putting, sending described disconnection control signal during overcurrent, promptly is connected to earth terminal VSS (pin 7) by the 7th capacitor C 7;

Its first input end VC1 (pin 15) is used to import the voltage of the first electric core positive pole, promptly is connected to anode B+ by the4th resistance R 4, is connected to power end VDD (pin 16) by first capacitor C 1 simultaneously;

Its second input VC2 (pin 14) is used to import the voltages at nodes of the first electric core negative pole and the second electric core positive pole, promptly is connected to Node B M3 by the 5th resistance R 5, is connected to power end VDD (pin 16) by the 3rd capacitor C 3 simultaneously;

Its 3rd input VC3 (pin 13) is used to import the voltages at nodes of the second electric core negative pole and the 3rd electric core positive pole, promptly is connected to Node B M2 by the 6th resistance R 6, is connected to power end VDD (pin 16) by second capacitor C 2 simultaneously;

Its four-input terminal VC4 (pin 12) is used to import the voltages at nodes of the 3rd electric core negative pole and the 4th electric core positive pole, promptly is connected to Node B M1 by the 11resistance R 11, is connected to power end VDD (pin 16) by the4th capacitor C 4 simultaneously; Four-input terminal VC4 (pin 12) is also by the 16 resistance R 16 ground connection;

Its charging control end COP (pin 1) connects the grid of second switch pipe Q2, and the grid of second switch pipe Q2 links to each other by second resistance R 2 with source electrode;

Its charge and discharge switch control end CTL (pin 11) is connected to earth terminal VSS (pin 7) by the 8th resistance R 8;

It overcharges, and detecting delays time is provided with end CCT (pin 6) sends described disconnection control signal when being used to be arranged on over-charging of battery delay time, promptly is connected to earth terminal VSS (pin 7) by the 6th capacitor C 6;

Its positive voltage test side VMP (pin 2) is connected to load by first resistance R 1;

Its negative supply voltage test side VINI (pin 4) is successively by the 7th resistance R 7 and the 13 resistance R 13 ground connection, the node of the 7th resistance R 7 and the 13 resistance R 13 is again by the 15resistance R 15 ground connection, the node of the 7th resistance R 7 and the 13 resistance R 13 is also received battery cathode by the 14resistance R 14, and battery cathode B-is by thetenth resistance R 10 ground connection.

In this circuit, current detectingunit 100 mainly is made up of the 7th resistance R the 7, the 13 resistance R the 13, the 14resistance R 14 and the 15resistance R 15, at first adopt the output current of 14 pairs ofbatteries 600 of the 14 resistance R to detect, detected output current is converted to a changing voltage through the 7th resistance R the 7, the 13 resistance R the 13, the 15resistance R 15 again, and this changing voltage is sent to the negative supply voltage test side VINI (pin 4) of chip S8254.

In this circuit,unit 500 being set mainly being made up of the 6th capacitor C 6 and the 7th capacitor C 7, is the delay time that scalable chip S8254 sends described disconnection control signal by the appearance value size of regulating the 6th capacitor C 6 and the 7th capacitor C 7.

Above-mentioned the4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 9th resistance R 9 and the 11resistance R 11 are protective resistance, are connected to above-mentioned a plurality of input and earth terminal VSS; First capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the4th capacitor C 4 and the 5th capacitor C 5 are filter resistance, are connected between above-mentioned a plurality of input and the power end VDD.Above-mentioned protective resistance and filter capacitor constitute detectingunit 100 together, not only chip S8254 are shielded, and also strobe, and can improve the precision of the voltage of input chip S8254.

This sentences thisbattery 600 and describes for the lithium electricity, so 2.5V is set to the minimum value of the threshold range of each electric core, 2.7V is set to the maximum of the threshold range of each electric core, and the course of work of this discharge protection circuit is as follows:

Battery 600 is in the process to load discharge; its voltage can reduce gradually along with discharge process; chip S8254 is by first input end VC1 (pin 15); the second input VC2 (pin 14); the 3rd input VC3 (pin 13); four-input terminal VC4 (pin 12) detects anode B+; Node B M3; the voltage at Node B M2 and Node B M1 place; as anode B+; Node B M3; when any one is lower than the minimum value (2.5V) of predefined voltage threshold scope in the voltage at Node B M2 and Node B M1 place; discharge control end DOP (pin 3) output disconnects control signal; this disconnection control signal is a high level signal; so; the 3rd switching tube Q3 turn-offs;battery 600 can't discharge to load again; play the over effect; at this moment; chip S8254 enters resting state; charging control end COP (pin 1) is high-impedance state, and discharge control end DOP (pin 3) is a high level.

When chip S8254 entered resting state, positive voltage test side VMP (pin 2) was pulled down to low level state, if insert charger this moment, then the voltage of positive voltage test side VMP (pin 2) raises, and over-discharge state is removed.

This circuit also has the over-charge protective function; inbattery 600 charging processes; charging control end COP (pin 1) goes up and is low level; second switch pipe Q2 conducting; at this moment, discharge control end DOP (pin 3) goes up and is high level, and the 3rd switching tube Q3 disconnects; but charger isbattery 600 chargings by the body diode of second switch pipe Q2 and the 3rd switching tube Q3 successively.When any one is higher than the maximum (2.7V) of predefined voltage threshold scope in the voltage at anode B+, Node B M3, Node B M2 and Node B M1 place; high level signal of charging control end COP (pin 1) output; charge circuit disconnects, and plays the over-charge protective effect.

This circuit also has overcurrent protection function, if the voltage difference between negative supply voltage test side VINI (pin 4) and the earth terminal VSS (pin 7), then produces the overcurrent protection action greater than set point.Described set point determines that by chip S8254 is inner consistent with predefined current threshold, in this circuit diagram, this set point is got 0.3V.When producing overcurrent protection; discharge control end DOP (pin 3) goes up and is high level; the 3rd switching tube Q3 disconnects; charge simultaneously and also be high level on the control end COP (pin 1); second switch pipe Q2 also disconnects, and positive voltage test side VMP (pin 2) also is a high level, so;battery 600 disconnects, andbattery 600 is shielded.

Above-mentioned detecting at chip S8254 put or over-current phenomenon avoidance disconnects between the control signal to sending, and one section delay time is also arranged, and the length of this delay time is by detecting the amount of capacity that time-delay is provided with the 7th capacitor C 7 that end CDT (pin 5) is connected and determine with crossing to put.In addition, above-mentioned detecting at chip S8254 overcharges phenomenon and disconnects between the control signal signal to sending, and one section delay time is also arranged, and the length of this delay time is by detecting the amount of capacity that time-delay is provided with the 6th capacitor C 6 that end CCT (pin 6) is connected and determine with overcharging.

In addition, the invention still further relates to a kind of portable lamp, it comprises above-mentioned described battery protecting circuit, repeats no more herein.

In sum, in battery protecting circuit of the present invention and the portable lamp, the output voltage of each electric core of series connection detects in 100 pairs of batteries ofvoltage detection unit 600, and the output current of 200 pairs of batteries of current detecting unit detects; Whencontrol unit 300 exceeds predefined voltage threshold scope or described output current greater than predefined current threshold at any one electric core output voltage, send the disconnection control signal,performance element 400 disconnects the current supply circuit ofbattery 600 when receiving described disconnection control signal, prevent thatbattery 600 from taking place to put, overcharging and over-current phenomenon avoidance, thereby avoid influencing the performance and the useful life ofbattery 600, even set off an explosion and cause safety problem.

The above only is embodiments of the invention, not in order to restriction the present invention, all any modifications of being done in the spirit and principles in the present invention, is equal to and replaces or improvement etc., all should be included in protection scope of the present invention.

Claims (10)

1. a battery protecting circuit is characterized in that, comprising:

Voltage detection unit: the output voltage to each electric core of connecting in the battery detects;

Current detecting unit: the output current to battery detects;

Control unit: when the output voltage of any one electric core exceeds predefined voltage threshold scope or described output current greater than predefined current threshold, send the disconnection control signal;

Performance element: the current supply circuit that when receiving described disconnection control signal, disconnects battery.

2. battery protecting circuit according to claim 1 is characterized in that, also comprises:

The unit is set: the delay time that described control unit is sent described disconnection control signal is provided with.

3. battery protecting circuit according to claim 2 is characterized in that, described control unit adopts the battery protection chip, and described battery protection chip comprises:

Power end (VDD): the voltage that is used to import anode;

Input: comprise a plurality ofly, import the positive pole of each electric core, the voltage of negative pole respectively;

Discharge control end (DOP): be used to export described disconnection control signal;

Time-delay is provided with end: be used to be provided with the delay time that sends described disconnection control signal;

Select switch terminal (SEL): the quantity of just selecting the electric core of connecting in the battery according to the level of this port;

Negative supply voltage test side (VINI): be used to import the changing voltage that the output current of described battery is converted to;

Earth terminal (VSS).

4. battery protecting circuit according to claim 3 is characterized in that, described performance element is connected between the positive pole and load of battery, is subjected to described discharge control end (DOP) to control its disconnection or conducting.

5. battery protecting circuit according to claim 4 is characterized in that described performance element comprises first switching tube, and its source electrode is connected to anode, and its drain electrode is connected to load, and its grid is connected to described discharge control end (DOP).

6. battery protecting circuit according to claim 4; it is characterized in that; described performance element comprises the second switch pipe and the 3rd switching tube of belt body diode; the source electrode of the 3rd switching tube is connected to anode; the drain electrode of the 3rd switching tube is connected to the drain electrode of second switch pipe; the source electrode of second switch pipe is connected to load; the body diode forward of second switch pipe is connected between the drain electrode and source electrode of second switch pipe; the body diode forward of the 3rd switching tube is connected between the drain electrode and source electrode of the 3rd switching tube; the grid of the 3rd switching tube is connected to described discharge control end (DOP), and the grid of second switch pipe also is subjected to described battery protection chip controls.

7. battery protecting circuit according to claim 3 is characterized in that,

The electric core of series connection is 4 in the described battery, and accordingly, described selection switch terminal (SEL) is a high level;

The electric core of series connection is 3 in the described battery, and accordingly, described selection switch terminal (SEL) is a low level.

8. battery protecting circuit according to claim 3; it is characterized in that, described detecting unit comprise the protective resistance that is connected to a plurality of inputs and earth terminal (VSS) and be connected to a plurality of inputs and power end (VDD) between filter capacitor.

9. battery protecting circuit according to claim 6, it is characterized in that, the electric core of series connection is 4 in the described battery, described anode is the positive pole of the first electric core, the negative pole of the first electric core links to each other with the positive pole of the second electric core, the negative pole of the second electric core links to each other with the positive pole of the 3rd electric core, and the negative pole of the 3rd electric core links to each other with the positive pole of the 4th electric core, and battery cathode is the negative pole of the 4th electric core;

Described battery protecting circuit comprises first resistance (R1), second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9), the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12), the 13 resistance (R13), the 14 resistance (R14), the 15 resistance (R15), the 16 resistance (R16), the 17 resistance (R17), the 18 resistance (R18), first electric capacity (C1), second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5), the 6th electric capacity (C6) and the 7th electric capacity (C7);

Described power end (VDD) is connected to anode;

Described earth terminal (VSS) is connected to anode by the 5th electric capacity (C5), is connected to battery cathode by the 9th resistance (R9) simultaneously;

By the 12 resistance (R12), the 17 resistance (R17) ground connection, the node of the 12 resistance (R12) and the 17 resistance (R17) is received power end (VDD) by the 18 resistance (R18) to described selection switch terminal (SEL) successively;

Described discharge control end (DOP) is connected to the grid of the 3rd switching tube by the 3rd resistance (R3);

Described negative supply voltage test side (VINI) is successively by the 7th resistance (R7) and the 13 resistance (R13) ground connection, the node of the 7th resistance (R7) and the 13 resistance (R13) is also by the 15 resistance (R15) ground connection, the node of the 7th resistance (R7) and the 13 resistance (R13) is received battery cathode by the 14 resistance (R14) again, and battery cathode is by the tenth resistance (R10) ground connection;

Described time-delay is provided with end and comprised putting and detect time-delay and end (CDT) is set and overcharges detection and delay time end (CCT) is set, cross to put and detect time-delay and end (CDT) is set is used to be arranged on battery and crosses the delay time of putting, sending described disconnection control signal during overcurrent, promptly be connected to earth terminal (VSS) by the 7th electric capacity (C7); Overcharge the detection time-delay end (CCT) sends described disconnection control signal when being used to be arranged on over-charging of battery delay time is set, promptly be connected to earth terminal (VSS) by the 6th electric capacity (C6);

Described input comprises:

First input end (VC1) is used to import the voltage of the first electric core positive pole, promptly is connected to anode by the 4th resistance (R4), is connected to power end (VDD) by first electric capacity (C1) simultaneously;

Second input (VC2) is used to import the voltages at nodes of the first electric core negative pole and the second electric core positive pole, promptly is connected to the first electric core negative pole by the 5th resistance (R5), is connected to power end (VDD) by the 3rd electric capacity (C3) simultaneously;

The 3rd input (VC3) is used to import the voltages at nodes of the second electric core negative pole and the 3rd electric core positive pole, promptly is connected to the second electric core negative pole by the 6th resistance (R6), is connected to power end (VDD) by second electric capacity (C2) simultaneously;

Four-input terminal (VC4) is used to import the voltages at nodes of the 3rd electric core negative pole and the 4th electric core positive pole, promptly is connected to the 3rd electric core negative pole by the 11 resistance (R11), is connected to power end (VDD) by the 4th electric capacity (C4) simultaneously; Four-input terminal (VC4) is also by the 16 resistance (R16) ground connection;

Described battery protection chip also comprises:

Charging control end (COP), the grid of connection second switch pipe, the grid of second switch pipe links to each other by second resistance (R2) with source electrode;

Charge and discharge switch control end (CTL) is connected to earth terminal (VSS) by the 8th resistance (R8);

Positive voltage test side (VMP), (R1) is connected to load by first resistance;

Battery cathode is by the tenth resistance (R10) ground connection.

10. a portable lamp is characterized in that, comprises battery protecting circuit, and described battery protecting circuit is any described battery protecting circuit in the claim 1 to 9.

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