CN203859501U - Battery pack discharge protection circuit and device - Google Patents
Battery pack discharge protection circuit and device Download PDFInfo
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- CN203859501U CN203859501U CN201420204189.1U CN201420204189U CN203859501U CN 203859501 U CN203859501 U CN 203859501U CN 201420204189 U CN201420204189 U CN 201420204189U CN 203859501 U CN203859501 U CN 203859501U
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Abstract
The utility model discloses a battery pack discharge protection circuit and a device. The battery pack discharge protection circuit comprises a discharge control module, a key switch module, a voltage comparison module, a sampling load, a first offset load, a second offset load and an over-current protection switch. According to the battery pack discharge protection circuit and the device, the first input end of the voltage comparison module is used for carrying out voltage detection on the discharge output end, the detected voltage is compared with 0V, the corresponding level is outputted to control the whole circuit to maintain conduction or on and off; in the case of overcurrent output or short circuit output of the battery pack, the voltage of the first input end of the voltage comparison module is smaller than 0V, the voltage comparison module outputs corresponding level signals to control the overcurrent protection switch to be conducted, the level of the triggering locking end of the discharge control module is lowered, the discharge control module is disconnected, the battery pack cuts off discharge, the battery pack can be prevented from being damaged due to overcurrent discharge and short circuit, and the service life of the battery pack is improved.
Description
Technical field
The utility model relates to battery discharge protection technical field, particularly a kind of battery power discharge protective circuit and device.
Background technology
At present, the electronic equipment of the overwhelming majority and the power supply of electrical equipment all adopt the secondary cell can recharge using, and are commonly called as rechargeable battery or storage battery.Such battery is a lot, has lead-acid battery, nickel-cadmium cell, and Ni-MH battery, lithium ion battery and lithium polymer battery etc., their characteristic is different, but common characteristic is to can be repeatedly charged and discharged to use hundreds of times to 1,000 times.
Such battery exists the situation of overcurrent electric discharge and short circuit to occur in discharge process, when the long-time overcurrent output of such battery electric discharge, can make inside battery that irreversible change occurs, and the lighter has impact to the life-span of battery, and severe one may cause security incident.Especially in the time of short circuit, very easily cause security incident.
Therefore, the utility model provides a kind of battery power discharge protective circuit and device, battery pack and whole discharge circuit are protected when the overcurrent electric discharge of battery and the short-circuit conditions.
Utility model content
Main purpose of the present utility model is for providing a kind of battery and safe battery power discharge protective circuit and device of improving.
The utility model proposes a kind of battery power discharge protective circuit, comprise control of discharge module, key switch module, voltage comparison module, sampling load, the first offset load, the second offset load and overcurrent protective switch, described control of discharge module is provided with input, output and triggering keyed end, described key switch module is provided with high level input, low level input and output, described voltage comparison module comprises first input end, the second input and output, described overcurrent protective switch comprises the first conduction terminal, the second conduction terminal and trigger end, wherein:
The input of described control of discharge module connects the positive pole of described battery pack, the output of described control of discharge module is electric discharge output, and the triggering keyed end of described control of discharge module connects respectively the first conduction terminal of output and the described overcurrent protective switch of described key switch module;
The high level input of described key switch module connects the positive pole of described battery pack, the low level input end grounding of described key switch module;
The output of described control of discharge module is connected to the negative pole of described battery pack successively through described the first offset load and the second offset load, the negative pole of described battery pack is through described sampling load ground connection;
The first input end of described voltage comparison module connects the output of described control of discharge module through described the first offset load, the second input end grounding of described voltage comparison module, the output of described voltage comparison module connects the trigger end of described overcurrent protective switch; The second conduction terminal ground connection of described overcurrent protective switch;
When the electric current of described electric discharge output exceedes predetermined current value; the voltage of the first input end of described voltage comparison module is less than 0V; described voltage comparison module is exported overcurrent protective switch conducting described in corresponding level signal control; the triggering keyed end ground connection of described control of discharge module; described control of discharge module disconnects, and described battery pack is cut off electric discharge.
Preferably, also comprise the filtration module between first input end and the first offset load that is connected in described voltage comparison module;
Described filtration module comprises filter resistance and filter capacitor, the first input end of described voltage comparison module is connected to the output of described control of discharge module successively through described filter resistance and the first offset load, the first input end of described voltage comparison module is also through described filter capacitor ground connection.
Preferably, described key switch module comprises unlatching key switch and closes key switch; The first end of described unlatching key switch connects the positive pole of described battery pack, and the second end of described unlatching key switch connects the triggering keyed end of described control of discharge module; Described first end ground connection of closing key switch, described in close key switch the second end connect the triggering keyed end of described control of discharge module.
Preferably, described battery pack at least comprises by its anodal first segment battery and final section battery that starts connection successively; Described control of discharge module comprises discharge switch, break-make locking switch, multiple protection switch and multiple detection module, and described detection module is corresponding one by one with the battery of battery pack, and described detection module is corresponding one by one with protection switch; Described break-make locking switch comprises the first conduction terminal, the second conduction terminal and trigger end, and described detection module is provided with test side, input and output, and described discharge switch and protection switch comprise input, output and trigger end, wherein:
The positive pole of the battery that the input of described protection switch is corresponding with it connects, and the test side of the detection module that the output of described protection switch is corresponding with it connects; The output of described battery pack is through described discharge switch electric discharge output;
The first conduction terminal of described break-make locking switch connects respectively the trigger end of described discharge switch and each protection switch, controls conducting and the cut-off of described discharge switch and each protection switch; The second conduction terminal ground connection of described break-make locking switch, the trigger end of described break-make locking switch is the triggering keyed end of described control of discharge module, the trigger end of described break-make locking switch is through a grounding through resistance;
Each detection module is electrically connected successively, from the detection module corresponding with described first segment battery, the output of previous detection module connects the input of next detection module, and the output of the detection module that described final section battery is corresponding is connected with the trigger end of described break-make locking switch; Each detection module is for detection of the voltage swing of its test side, and in the time that the voltage of any test side is less than voltage threshold, disconnects the output of its detection module.
Preferably, described detection module comprises voltage measurement submodule, photoelectrical coupler and current-limiting resistance, and described voltage measurement submodule is provided with first input end, the second input and output, wherein:
The primary input terminal parallel connection of all photoelectrical couplers, and the test side of the detection module corresponding with described first segment battery connects, the primary output terminal of each photoelectrical coupler connects the second input of its corresponding voltage measurement submodule by current-limiting resistance, the secondary of all photoelectrical couplers is connected in series; The secondary input of the photoelectrical coupler of the detection module corresponding with described first segment battery connects its primary input terminal, and the secondary output end of the photoelectrical coupler of the detection module that described final section battery is corresponding connects the trigger end of described break-make locking switch;
The first input end of described voltage measurement submodule is connected with the test side of its detection module; Each voltage measurement submodule is electrically connected successively, and the output of previous voltage measurement submodule connects the first input end of next voltage measurement submodule; The output head grounding of the measurement submodule of the detection module that described final section battery is corresponding.
Preferably, described voltage measurement submodule comprises the first resistance, the second resistance and three end parallel voltage-stabilizing chips, wherein:
One end of described the first resistance is connected with described first input end, and the other end connects respectively one end of described the second resistance and the detection utmost point of described three end parallel voltage-stabilizing chips; The other end of described the second resistance connects the output of described voltage measurement submodule; The anode of described three end parallel voltage-stabilizing chips connects the primary output terminal of described photoelectrical coupler through described current-limiting resistance, the negative electrode of described three end parallel voltage-stabilizing chips is connected with the other end of described the second resistance.
Preferably, described break-make locking switch is NMOS pipe, and the first conduction terminal of described break-make locking switch is source electrode, and the second conduction terminal of described break-make locking switch is drain electrode, and the trigger end of described break-make locking switch is grid;
Described protection switch is PMOS pipe, and the input of described protection switch is source electrode, and the output of described protection switch is drain electrode, and the trigger end of described protection switch is grid;
Described discharge switch is PMOS pipe, and the input of described discharge switch is source electrode, and the output of described discharge switch is drain electrode, and the trigger end of described discharge switch is grid.
Preferably, described voltage comparison module comprises voltage comparator, the first input end of described voltage comparison module connects the electrode input end of described voltage comparator, the second input of described voltage comparison module connects the negative input of described voltage comparator, and the output of described voltage comparison module connects the output of described voltage comparator;
Described overcurrent protective switch is positive-negative-positive triode, and the first conduction terminal of described overcurrent protective switch is emitter, and the second conduction terminal of described overcurrent protective switch is collector electrode, and the trigger end of described overcurrent protective switch is base stage.
Preferably, described voltage comparison module comprises voltage comparator, the first input end of described voltage comparison module connects the negative input of described voltage comparator, the second input of described voltage comparison module connects the electrode input end of described voltage comparator, and the output of described voltage comparison module connects the output of described voltage comparator;
Described overcurrent protective switch is NPN type triode, and the first conduction terminal of described overcurrent protective switch is collector electrode, and the second conduction terminal of described overcurrent protective switch is emitter, and the trigger end of described overcurrent protective switch is base stage.
The utility model also proposes a kind of battery power discharge protective device, comprises battery power discharge protective circuit as above.
Battery power discharge protective circuit of the present utility model and device, first input end by voltage comparison module carries out voltage detecting to its electric discharge output, by the magnitude of voltage comparison of the magnitude of voltage detecting and its second input, export the whole circuit of corresponding level control and keep conducting or shutoff, in the time of battery pack overcurrent output or short circuit output (output that now discharges exceed electric current preset value), the voltage of the first input end of voltage comparison module is less than 0V, voltage comparison module is exported the conducting of corresponding level signal control overcurrent protective switch, and then the triggering keyed end level of control of discharge module is dragged down, control of discharge module is disconnected, battery pack is cut off electric discharge, avoid battery pack to damage because of overcurrent electric discharge and short circuit, improve the useful life of battery pack.
Brief description of the drawings
Fig. 1 is the schematic diagram of the utility model battery power discharge protective circuit the first embodiment;
Fig. 2 is the schematic diagram of the utility model battery power discharge protective circuit the second embodiment;
Fig. 3 is the circuit diagram of the utility model battery power discharge protective circuit the 3rd embodiment;
Fig. 4 is the schematic diagram of detection module in the utility model battery power discharge protective circuit the 3rd embodiment;
Fig. 5 is the circuit diagram of voltage measurement submodule in the utility model battery power discharge protective circuit the 3rd embodiment.
Realization, functional characteristics and the advantage of the utility model object, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, Fig. 1 is the composition schematic diagram of the utility model battery power discharge protective circuit one embodiment.
As shown in Figures 1 to 5; Fig. 1 is the schematic diagram of the utility model battery power discharge protective circuit the first embodiment; Fig. 2 is the schematic diagram of the utility model battery power discharge protective circuit the second embodiment; Fig. 3 is the circuit diagram of the utility model battery power discharge protective circuit the 3rd embodiment; Fig. 4 is the schematic diagram of detection module in the utility model battery power discharge protective circuit the 3rd embodiment, and Fig. 5 is the circuit diagram of voltage measurement submodule in the utility model battery power discharge protective circuit the 3rd embodiment.
With reference to Fig. 1; battery pack 10 discharge protection circuits that the present embodiment proposes; be connected with battery pack 10, these battery pack 10 discharge protection circuits comprise control of discharge module 20, key switch module 30, voltage comparison module 40, sampling load Rs, the first offset load Rv, the second offset load Rf and overcurrent protective switch 50.Control of discharge module 20 is provided with input a1, output a2 and triggers keyed end a3; key switch module 30 is provided with high level input b1, low level input b2 and output b4; voltage comparison module 40 comprises first input end c1, the second input c2 and output c3; overcurrent protective switch 50 comprises the first conduction terminal, the second conduction terminal and trigger end, wherein:
The input a1 of control of discharge module 20 connects the positive pole of battery pack 10, the output a2 of control of discharge module 20 is electric discharge output end vo, and the triggering keyed end a3 of control of discharge module 20 connects the first conduction terminal of output b3 and the overcurrent protective switch 50 of key switch module 30;
The high level input b1 of key switch module 30 connects the positive pole of battery pack 10, the low level input b2 ground connection of key switch module 30;
The output a2 of control of discharge module 20 is connected to the negative pole of battery pack 10 successively through the first offset load Rv and the second offset load Rf, the negative pole of battery pack 10 is through sampling load Rs ground connection;
The first input end c1 of voltage comparison module 40 connects the output a2 of control of discharge module 20 through the first offset load Rv, the second input c2 ground connection of voltage comparison module 40, and the output c3 of voltage comparison module 40 connects the trigger end of overcurrent protective switch 50; The second conduction terminal ground connection of overcurrent protective switch 50.
When the electric current of electric discharge output end vo exceedes predetermined current value (predetermined current value is determined according to sampling load Rs, the first biasing resistor and the second biasing resistor resistance relation separately); the voltage of the first input end c1 of voltage comparison module 40 is less than 0V (being the voltage of its second input c2); voltage comparison module 40 is exported 50 conductings of corresponding level signal control overcurrent protective switch; the triggering keyed end ground connection of control of discharge module 20; control of discharge module 20 disconnects, and battery pack 10 is cut off electric discharge.
The specific works principle of battery pack 10 discharge protection circuits of the present embodiment is as follows:
1, pass through the output b3 of key switch module 30 and its high level input b1 conducting, its output b3 is high level; And then the triggering keyed end a3 of control of discharge module 20 is high level, control of discharge module 20 is worked, the input a1 of control of discharge module 20 and output a2 conducting, battery pack 10 is discharged from electric discharge output end vo through control of discharge module 20, the triggering keyed end a3 of control of discharge module 20 is locked in high level, keeps control of discharge module 20 conducting of working.
2,, in the time that battery pack 10 is discharged, the output a2 of control of discharge module 20 forms current circuit through the first offset load Rv and the second offset load Rf to the negative pole of battery pack 10, forms positive bias voltage at the second offset load Rf two ends; Sampling load Rs is connected between the negative pole and ground of battery pack 10, forms negative voltage at sampling load Rs two ends.The magnitude of voltage of the first input end c1 of voltage comparison module 40 is the magnitude of voltage after this positive bias voltage superposes with the negative voltage at sampling load Rs two ends; the voltage of voltage comparison module 40 first input end c1 and the voltage of the second input c2 (being also 0v) compare; its output c3 exports the trigger end of corresponding level to overcurrent protective switch 50, controls overcurrent protective switch 50 ON/OFF.
Concrete, when battery pack 10 discharge protection circuits are normally worked, the electric current that flows through sampling load Rs is less, the negative voltage at sampling load Rs two ends is less, after the positive bias voltage that the first offset load Rv two ends form and the stack of this negative voltage, it is positive voltage, the first input end c1 that is voltage comparison module 40 is positive voltage, be greater than the voltage of its second input c2, voltage comparison module 40 export the first level (high level or low level) control overcurrent protective switch 50 remain open, battery pack 10 discharge protection circuit maintenance work; When the electric discharge output end vo overcurrent output of battery pack 10 discharge protection circuits or its short circuit; flow through the electric current sampling on load Rs very large; the negative voltage at sampling load Rs two ends is very large; after the positive bias voltage at the first offset load Rv two ends and the stack of this negative voltage, it is negative voltage; the first input end c1 that is voltage comparison module 40 is negative voltage, is less than the voltage of the second input c2.Voltage comparison module 40 export second electrical level (low level or high level) control overcurrent protective switch 50 open; the first conduction terminal of overcurrent protective switch 50 and its second conduction terminal conducting; be its first conduction terminal ground connection; thereby the triggering keyed end ground connection of control of discharge module 20; current potential is dragged down, and control of discharge module 20 is turn-offed, and the input a1 of control of discharge module 20 and its output a2 disconnect; battery pack 10 stops electric discharge, to realize overcurrent or the short-circuit protection to battery pack 10.
In the time of battery pack 10 electric discharge output, by the output of key switch module 30 is connected with its low level input, realize and initiatively turn-off control of discharge module 20, thereby make battery pack 10 stop electric discharge.
Battery pack 10 discharge protection circuits that the present embodiment proposes, first input end by voltage comparison module 40 carries out voltage detecting to its electric discharge output end vo, by the magnitude of voltage comparison of the magnitude of voltage detecting and its second input, export the whole circuit of corresponding level control and keep conducting or shutoff, in the time of battery pack 10 overcurrents outputs or short circuit output (output end vo that now discharges exceed electric current preset value), the voltage of the first input end of voltage comparison module 40 is less than 0V, voltage comparison module 40 is exported 50 conductings of corresponding level signal control overcurrent protective switch, and then the triggering keyed end level of control of discharge module 20 is dragged down, control of discharge module 20 is disconnected, battery pack 10 is cut off electric discharge, avoid battery pack 10 to damage because of overcurrent electric discharge and short circuit, improve the useful life of battery pack 10.
Further, see figures.1.and.2, the scheme of the present embodiment based on the first embodiment.In battery pack 10 discharge protection circuits of the present embodiment, battery pack 10 at least comprises by its anodal first segment battery 101 and final section battery 102 that starts connection successively.Control of discharge module 20 comprises discharge switch 21, break-make locking switch 22, multiple protection switch 23 and multiple detection module 24, and detection module 24 is corresponding one by one with the battery of battery pack 10, and detection module 24 is corresponding one by one with protection switch 23; Break-make locking switch 22 comprises the first conduction terminal, the second conduction terminal and trigger end, and detection module 24 is provided with test side 5, input 6 and output 7, and discharge switch 21 and protection switch 23 comprise input, output and trigger end, wherein:
The positive pole of the battery that the input of protection switch 23 is corresponding with it connects, and the test side 5 of the detection module 24 that the output of protection switch 23 is corresponding with it connects; The output of battery pack 10 is through discharge switch 21 electric discharge outputs;
The first conduction terminal of break-make locking switch 22 connects respectively the trigger end of discharge switch 21 and each protection switch 23, conducting and the cut-off of controlled discharge switch 21 and each protection switch 23; The second conduction terminal ground connection of break-make locking switch 22, the trigger end of break-make locking switch 22 is the triggering keyed end a3 of control of discharge module 20, the trigger end of break-make locking switch 22 is through resistance R 1 ground connection;
Each detection module 24 is electrically connected successively, and from the detection module corresponding with first segment battery 101 24, the output 7 of previous detection module 24 connects the input 6 of next detection module 24; The output 7 of the detection module 24 of final section battery 102 correspondences is connected with the trigger end of break-make locking switch 22; Each detection module 24 is for detection of the voltage swing of its test side 5, and in the time that the voltage of any test side 5 is less than voltage threshold, disconnects the output of its detection module 24.
In the present embodiment, the operation principle of control of discharge module 20 is as follows:
When the trigger end of break-make locking switch 22 is high level; 22 conductings of break-make locking switch; its first conduction terminal and the second conduction terminal are communicated to ground; the trigger end of discharge switch 21 and each protection switch 23 is low level; discharge switch 21 and each all conducting of protection switch 23; the positive pole of battery pack 10 is through described discharge switch 21 electric discharge outputs, the voltage at each its corresponding battery two ends of detection module 24 operation detection.(voltage threshold is a set point to be all greater than voltage threshold at the voltage at each battery two ends, specifically determine according to the parameter of the components and parts in detection module 24) time, the electric current of the output 7 of last detection module 24 arrives ground through the resistance of the trigger end of break-make locking switch 22, the trigger end of locking switch of making to switch on is high level (the triggering keyed end that is also control of discharge module 20 is locked in high level) always, energising locking switch keeps conducting, and battery pack 10 keeps electric discharge output.Any one detection module 24 detects when the voltage at its corresponding battery two ends is less than voltage threshold therein, the output 7 of this detection module 24 disconnects no current output, and then the loop that whole detection module 24 series connection are formed disconnects, the also no current output of the output 7 of last detection module 24, the trigger end of break-make locking switch 22 is low level, break-make locking switch 22 disconnects, and then the trigger end of discharge switch 21 and each protection switch 23 and ground are disconnected, discharge switch 21 and each protection switch 23 all end, battery pack 10 stops electric discharge output, each detection module 24 also quits work, be that whole circuit shutoff quits work.
With reference to Fig. 1-Fig. 5, the scheme of the present embodiment based on the first and second embodiment.In the present embodiment, detection module 24 comprises voltage measurement submodule 241, photoelectrical coupler and current-limiting resistance Rx, and voltage measurement submodule 241 is provided with first input end 8, the second input 9 and output 10, wherein:
Primary input terminal 1 parallel connection of all photoelectrical couplers, and the test side 5 of the detection module 24 corresponding with first segment battery 101 connects, the primary output terminal 2 of each photoelectrical coupler connects the second input 9 of its corresponding voltage measurement submodule 241 by current-limiting resistance Rx, the secondary of all photoelectrical couplers is connected in series; The secondary input 3 of the photoelectrical coupler of the detection module 24 corresponding with first segment battery 101 connects its primary input terminal 1, and the secondary output end 4 of the photoelectrical coupler of the detection module 24 of final section battery 102 correspondences connects the trigger end of break-make locking switch 22;
The first input end 8 of voltage measurement submodule 241 is connected with the test side 5 of its detection module 24; Each voltage measurement submodule 241 is electrically connected successively, and the output 10 of previous voltage measurement submodule 241 connects the first input end 8 of next voltage measurement submodule 241; Output 10 ground connection of the measurement submodule of the detection module 24 of final section battery 102 correspondences.
Voltage measurement submodule 241 comprises the first resistance R 7, the second resistance R 8 and three end parallel voltage-stabilizing chip U2, and one end of the first resistance R 7 is connected with first input end 8, and the other end connects respectively one end of the second resistance R 8 and the detection utmost point of three end parallel voltage-stabilizing chip U2; The other end of the second resistance R 8 connects the output 10 of voltage measurement submodule 241; The negative electrode that the anode of three end parallel voltage-stabilizing chip U2 connects primary output terminal 2, the three end parallel voltage-stabilizing chip U2 of photoelectrical coupler U1 through current-limiting resistance Rx is connected with the other end of the second resistance.That the present embodiment photoelectrical coupler U1 selects is the photoelectrical coupler U1 of light-emitting diode and phototriode composition, and this coupler light-emitting diode is elementary, and phototriode is secondary.
The operation principle of detection module 24 is: when the voltage of the first input end 8 of voltage measurement submodule 241 is more than or equal to voltage threshold, the voltage of the detection utmost point of three end parallel voltage-stabilizing chip U2 reaches its conducting voltage, three end parallel voltage-stabilizing chip U2 conductings, thereby make the elementary conducting of photoelectrical coupler U1, the elementary conducting of photoelectrical coupler U1 makes the secondary conducting of photoelectrical coupler U1; In the time that the voltage of the first input end 8 of all voltage measurement submodules 241 is all more than or equal to voltage threshold; all all conducting work of photoelectrical coupler U1; the loop conducting of U1 level series connection of photoelectrical coupler; the output of all detection modules 24 has voltage; the trigger end of break-make locking switch 22 is high level; 22 conductings of break-make locking switch, make discharge switch 21 and each protection switch 23 keep the state of conducting, and circuit is normally worked.In the time having the voltage of first input end 8 of a voltage measurement submodule 241 to be less than voltage threshold; there is not conducting of a photoelectrical coupler U1; after photoelectricity and the loop of its secondary series connection just disconnects; output 7 no-voltages of detection module 24; the trigger end of break-make locking switch 22 is low level, and break-make locking switch 22 disconnects, and discharge switch 21 and all protection switches 23 all disconnect; battery pack 10 stops electric discharge, and whole circuit turn-offs.
Concrete, in the present embodiment, break-make locking switch 22 is NMOS pipe Q5, and the first conduction terminal of break-make locking switch 22 is source electrode, and the second conduction terminal of break-make locking switch 22 is drain electrode, and the trigger end of break-make locking switch 22 is grid; The first conduction terminal of break-make locking switch 22 is connected to each protection switch 23 through resistance R 5, and trigger end connects the output of last detection module 24 through a resistance R 6.Protection switch 23 is PMOS pipe (being respectively Q2, Q3, Q4 in figure), and the input of protection switch 23 is source electrode, and the output of protection switch 23 is drain electrode, and the trigger end of protection switch 23 is grid; Discharge switch 21 is PMOS pipe Q1, and the input of discharge switch 21 is source electrode, and the output of discharge switch 21 is drain electrode, and the trigger end of discharge switch 21 is grid; The grid of discharge switch 21 and each protection switch 23 is connected to the first conduction terminal of break-make locking switch 22 through a resistance and diode.Certainly, it is example that the present embodiment is just selected the switching tube of the above-mentioned type, and above-mentioned each switching tube can replace with the other types switching tube of same switch performance.
Further, in the present embodiment, voltage comparison module 40 comprises voltage comparator.The first input end c1 of voltage comparison module 40 connects the electrode input end of voltage comparator, and the second input c2 of voltage comparison module 40 connects the negative input of voltage comparator, and the output c3 of voltage comparison module 40 connects the output of voltage comparator; Overcurrent protective switch 50 is positive-negative-positive triode Q6, the first conduction terminal of overcurrent protective switch 50 be emitter, the second conduction terminal of overcurrent protective switch 50 is collector electrode, the trigger end of overcurrent protective switch 50 is base stage.When battery pack 10 overcurrent outputs or short circuit output; the voltage of the electrode input end of voltage comparator is for negative; be less than the voltage of negative input; voltage comparator output low level is to the base stage of positive-negative-positive triode Q6; positive-negative-positive triode conducting Q6, by the trigger end ground connection of break-make locking switch 22, break-make locking switch 22 disconnects; whole circuit turn-offs, the safety of protection battery pack 10.In the present embodiment, taking overcurrent protective switch 50 as positive-negative-positive triode Q6 is as example, what overcurrent protective switch 50 can also be for PMOS pipe or other types has said function switching tube or a device.
Voltage comparison module 40 also can connect by following connected mode:
The first input end c1 of voltage comparison module 40 connects the negative input of voltage comparator, and the second input c2 of voltage comparison module 40 connects the electrode input end of voltage comparator, and the output c3 of voltage comparison module 40 connects the output of voltage comparator; Overcurrent protective switch 50 is NPN type triode, the first conduction terminal of overcurrent protective switch 50 be collector electrode, the second conduction terminal of overcurrent protective switch 50 is emitter, the trigger end of overcurrent protective switch 50 is base stage.This kind of mode is in the time of battery pack 10 overcurrent outputs or short circuit output; negative input is the voltage that negative voltage is less than electrode input end; NPN type triode conducting when voltage comparator output high level; thereby by the trigger end ground connection of break-make locking switch 22; and then turn-off whole circuit, protect the safety of battery pack 10.In the present embodiment, taking overcurrent protective switch 50 as NPN type triodes as example, overcurrent protective switch 50 can also have for NMOS pipe, other types switching tube or the device of said function.
In the present embodiment, overcurrent protective switch 50 first conduction terminal connect the trigger end (being the triggering keyed end of control of discharge module 20) of break-make locking switch 22 by diode D1.
Further, in above-mentioned arbitrary embodiment, specifically with reference to Fig. 3, key switch module 30 comprises opens key switch K1 and closes key switch K2; The first end of opening key switch K1 connects the positive pole of battery pack 10, and the second end of opening key switch K1 connects the triggering keyed end a3 of control of discharge module 20; Close the first end ground connection of key switch K2, second end of closing key switch K2 connects the triggering keyed end a3 of control of discharge module 20.The first end of opening key switch K1 in Fig. 3 connects the positive pole of battery pack 10 through resistance R 4.Open key switch K1 and press while unlatching, the triggering keyed end of control of discharge module 20 is high level, and control of discharge module 20 is worked, and battery pack 10 is through the 20 electric discharge outputs of control of discharge module; Now open key switch K1 and disconnect, the triggering keyed end of control of discharge module 20 is locked in high level, and battery pack 10 keeps electric discharge output.By closing key switch K2, the triggering keyed end of control of discharge module 20 is become to low level, initiatively close control of discharge module 20, close whole circuit, battery pack 10 stops electric discharge.In the present embodiment, open key switch K1 and close key switch K2 and can preferably touch not locking switch, making more convenient operation.
Further; in above-mentioned arbitrary embodiment; specifically with reference to Fig. 3, battery pack 10 current foldback circuits also comprise filtration module 60 between first input end c1 and the first offset load Rv that is connected in voltage comparison module 40 (, prevent that voltage comparison module 40 is disturbed.Preferred filtration module 60 in the 3rd embodiment comprises filter resistance R2 and filter capacitor C1, the first input end c1 of voltage comparison module 40 is connected to the output a2 of control of discharge module 20 successively through filter resistance R2 and the first offset load Rv, the first input end c1 of voltage comparison module 40 is also through filter capacitor C1 ground connection.
The utility model also proposes a kind of battery pack 10 discharge protectors; comprise battery pack 10 discharge protection circuits; these battery pack 10 discharge protection circuits can comprise the technical scheme in above-mentioned arbitrary embodiment, and its detailed circuit structure can, with reference to earlier figures 1 to Fig. 5, not repeat at this.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (10)
1. a battery power discharge protective circuit, it is characterized in that, comprise control of discharge module, key switch module, voltage comparison module, sampling load, the first offset load, the second offset load and overcurrent protective switch, described control of discharge module is provided with input, output and triggering keyed end, described key switch module is provided with high level input, low level input and output, described voltage comparison module comprises first input end, the second input and output, described overcurrent protective switch comprises the first conduction terminal, the second conduction terminal and trigger end, wherein:
The input of described control of discharge module connects the positive pole of described battery pack, the output of described control of discharge module is electric discharge output, and the triggering keyed end of described control of discharge module connects respectively the first conduction terminal of output and the described overcurrent protective switch of described key switch module;
The high level input of described key switch module connects the positive pole of described battery pack, the low level input end grounding of described key switch module;
The output of described control of discharge module is connected to the negative pole of described battery pack successively through described the first offset load and the second offset load, the negative pole of described battery pack is through described sampling load ground connection;
The first input end of described voltage comparison module connects the output of described control of discharge module through described the first offset load, the second input end grounding of described voltage comparison module, the output of described voltage comparison module connects the trigger end of described overcurrent protective switch; The second conduction terminal ground connection of described overcurrent protective switch;
When the electric current of described electric discharge output exceedes predetermined current value; the voltage of the first input end of described voltage comparison module is less than 0V; described voltage comparison module is exported overcurrent protective switch conducting described in corresponding level signal control; the triggering keyed end ground connection of described control of discharge module; described control of discharge module disconnects, and described battery pack is cut off electric discharge.
2. battery power discharge protective circuit according to claim 1, is characterized in that, also comprises the filtration module between first input end and the first offset load that is connected in described voltage comparison module;
Described filtration module comprises filter resistance and filter capacitor, the first input end of described voltage comparison module is connected to the output of described control of discharge module successively through described filter resistance and the first offset load, the first input end of described voltage comparison module is also through described filter capacitor ground connection.
3. battery power discharge protective circuit according to claim 1, is characterized in that, described key switch module comprises opens key switch and closes key switch; The first end of described unlatching key switch connects the positive pole of described battery pack, and the second end of described unlatching key switch connects the triggering keyed end of described control of discharge module; Described first end ground connection of closing key switch, described in close key switch the second end connect the triggering keyed end of described control of discharge module.
4. battery power discharge protective circuit according to claim 1, is characterized in that, described battery pack at least comprises by its anodal first segment battery and final section battery that starts connection successively; Described control of discharge module comprises discharge switch, break-make locking switch, multiple protection switch and multiple detection module, and described detection module is corresponding one by one with the battery of battery pack, and described detection module is corresponding one by one with protection switch; Described break-make locking switch comprises the first conduction terminal, the second conduction terminal and trigger end, and described detection module is provided with test side, input and output, and described discharge switch and protection switch comprise input, output and trigger end, wherein:
The positive pole of the battery that the input of described protection switch is corresponding with it connects, and the test side of the detection module that the output of described protection switch is corresponding with it connects; The output of described battery pack is through described discharge switch electric discharge output;
The first conduction terminal of described break-make locking switch connects respectively the trigger end of described discharge switch and each protection switch, controls conducting and the cut-off of described discharge switch and each protection switch; The second conduction terminal ground connection of described break-make locking switch, the trigger end of described break-make locking switch is the triggering keyed end of described control of discharge module, the trigger end of described break-make locking switch is through a grounding through resistance;
Each detection module is electrically connected successively, from the detection module corresponding with described first segment battery, the output of previous detection module connects the input of next detection module, and the output of the detection module that described final section battery is corresponding is connected with the trigger end of described break-make locking switch; Each detection module is for detection of the voltage swing of its test side, and in the time that the voltage of any test side is less than voltage threshold, disconnects the output of its detection module.
5. battery power discharge protective circuit according to claim 4; it is characterized in that; described detection module comprises voltage measurement submodule, photoelectrical coupler and current-limiting resistance, and described voltage measurement submodule is provided with first input end, the second input and output, wherein:
The primary input terminal parallel connection of all photoelectrical couplers, and the test side of the detection module corresponding with described first segment battery connects, the primary output terminal of each photoelectrical coupler connects the second input of its corresponding voltage measurement submodule by current-limiting resistance, the secondary of all photoelectrical couplers is connected in series; The secondary input of the photoelectrical coupler of the detection module corresponding with described first segment battery connects its primary input terminal, and the secondary output end of the photoelectrical coupler of the detection module that described final section battery is corresponding connects the trigger end of described break-make locking switch;
The first input end of described voltage measurement submodule is connected with the test side of its detection module; Each voltage measurement submodule is electrically connected successively, and the output of previous voltage measurement submodule connects the first input end of next voltage measurement submodule; The output head grounding of the measurement submodule of the detection module that described final section battery is corresponding.
6. battery power discharge protective circuit according to claim 5, is characterized in that, described voltage measurement submodule comprises the first resistance, the second resistance and three end parallel voltage-stabilizing chips, wherein:
One end of described the first resistance is connected with described first input end, and the other end connects respectively one end of described the second resistance and the detection utmost point of described three end parallel voltage-stabilizing chips; The other end of described the second resistance connects the output of described voltage measurement submodule; The anode of described three end parallel voltage-stabilizing chips connects the primary output terminal of described photoelectrical coupler through described current-limiting resistance, the negative electrode of described three end parallel voltage-stabilizing chips is connected with the other end of described the second resistance.
7. battery power discharge protective circuit according to claim 4, it is characterized in that, described break-make locking switch is NMOS pipe, and the first conduction terminal of described break-make locking switch is source electrode, the second conduction terminal of described break-make locking switch is drain electrode, and the trigger end of described break-make locking switch is grid;
Described protection switch is PMOS pipe, and the input of described protection switch is source electrode, and the output of described protection switch is drain electrode, and the trigger end of described protection switch is grid;
Described discharge switch is PMOS pipe, and the input of described discharge switch is source electrode, and the output of described discharge switch is drain electrode, and the trigger end of described discharge switch is grid.
8. according to the battery power discharge protective circuit described in any one in claim 1-7, it is characterized in that, described voltage comparison module comprises voltage comparator, the first input end of described voltage comparison module connects the electrode input end of described voltage comparator, the second input of described voltage comparison module connects the negative input of described voltage comparator, and the output of described voltage comparison module connects the output of described voltage comparator;
Described overcurrent protective switch is positive-negative-positive triode, and the first conduction terminal of described overcurrent protective switch is emitter, and the second conduction terminal of described overcurrent protective switch is collector electrode, and the trigger end of described overcurrent protective switch is base stage.
9. according to the battery power discharge protective circuit described in any one in claim 1-7, it is characterized in that, described voltage comparison module comprises voltage comparator, the first input end of described voltage comparison module connects the negative input of described voltage comparator, the second input of described voltage comparison module connects the electrode input end of described voltage comparator, and the output of described voltage comparison module connects the output of described voltage comparator;
Described overcurrent protective switch is NPN type triode, and the first conduction terminal of described overcurrent protective switch is collector electrode, and the second conduction terminal of described overcurrent protective switch is emitter, and the trigger end of described overcurrent protective switch is base stage.
10. a battery power discharge protective device, is characterized in that, comprises battery power discharge protective circuit as claimed in any one of claims 1-9 wherein.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420204189.1U CN203859501U (en) | 2014-04-23 | 2014-04-23 | Battery pack discharge protection circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420204189.1U CN203859501U (en) | 2014-04-23 | 2014-04-23 | Battery pack discharge protection circuit and device |
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| CN203859501U true CN203859501U (en) | 2014-10-01 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811502A (en) * | 2016-03-22 | 2016-07-27 | 深圳天邦达科技有限公司 | OZ8952 chip based improved type lithium battery pack management circuit |
| CN107370211A (en) * | 2017-08-15 | 2017-11-21 | 宁夏黑金昊源绿能科技有限公司 | voltage switching output device and method |
| CN113777520A (en) * | 2021-09-16 | 2021-12-10 | 浪潮商用机器有限公司 | Test method, device, system and medium for board-mounted power supply overcurrent protection |
| CN113991813A (en) * | 2021-12-28 | 2022-01-28 | 深圳市永联科技股份有限公司 | Voltage control method and related device |
-
2014
- 2014-04-23 CN CN201420204189.1U patent/CN203859501U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811502A (en) * | 2016-03-22 | 2016-07-27 | 深圳天邦达科技有限公司 | OZ8952 chip based improved type lithium battery pack management circuit |
| CN105811502B (en) * | 2016-03-22 | 2018-12-04 | 深圳天邦达科技有限公司 | A kind of modified lithium battery group management circuit based on OZ8952 chip |
| CN107370211A (en) * | 2017-08-15 | 2017-11-21 | 宁夏黑金昊源绿能科技有限公司 | voltage switching output device and method |
| CN113777520A (en) * | 2021-09-16 | 2021-12-10 | 浪潮商用机器有限公司 | Test method, device, system and medium for board-mounted power supply overcurrent protection |
| CN113991813A (en) * | 2021-12-28 | 2022-01-28 | 深圳市永联科技股份有限公司 | Voltage control method and related device |
| CN113991813B (en) * | 2021-12-28 | 2022-03-29 | 深圳市永联科技股份有限公司 | Voltage control method and related device |
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