CN105048422B - Switching transistor pressure drop holding circuit and application have the lithium battery protection circuit of the pressure drop holding circuit - Google Patents
Switching transistor pressure drop holding circuit and application have the lithium battery protection circuit of the pressure drop holding circuit Download PDFInfo
- Publication number
- CN105048422B CN105048422B CN201510557034.5A CN201510557034A CN105048422B CN 105048422 B CN105048422 B CN 105048422B CN 201510557034 A CN201510557034 A CN 201510557034A CN 105048422 B CN105048422 B CN 105048422B
- Authority
- CN
- China
- Prior art keywords
- field
- effect tube
- pressure drop
- comparator
- grid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electronic Switches (AREA)
Abstract
A kind of switching transistor pressure drop holding circuit, including the first field-effect tube, it is characterised in that：The first input end of the pressure drop holding circuit connects the first FET drain, and the second input terminal is connected with the drive signal of the first field-effect tube, and output terminal connects the grid of the first field-effect tube, the source electrode ground connection of the first field-effect tube；When the second input terminal is low level " 0 ", the output terminal of pressure drop holding circuit is always low level " 0 "；When it is high level " 1 " that the voltage of first input end and ground, which is more than reference voltage and the second input terminal, pressure drop holding circuit output terminal is high level " 1 "；When it is high level " 1 " that the voltage of first input end and ground, which is less than reference voltage and the second input terminal, pressure drop holding circuit output terminal is low level " 0 ".The advantage of the invention is that：Circuit structure is simple, in the case where load current is extremely small, makes the voltage drop value all the time in the first field-effect tube with setting, ensures the normal power-up work of whole li-ion cell protection control circuit.
Description
Technical field
The present invention relates to a kind of pressure drop holding circuit, particularly a kind of switching transistor pressure drop holding circuit and application this
The lithium battery charge and discharge protective circuit of pressure drop holding circuit.
Background technology
Lithium battery in use, overcharges, over-discharge or overload current can all influence battery uses the longevity
Life and performance, for consideration safe to use, the battery core design of lithium battery must install protection circuit additional, to prevent because overcharging, cross and put
Or short circuit and caused by the danger such as cells burst, explosion.In actual use, circuit power consumption when non-loaded is claimed in people
It is more few better, preferably not power consumption.
As shown in fig. 6, be the line assumption diagram for the lithium battery charge and discharge protective circuit that can be realized at present, the protection circuit
It is constant or in the case that load current is larger (such as several amperes to hundreds of amperes) in load current, as long as usually loading back
A sample resistance (not shown) with setting resistance value is concatenated in road, when loading RL connections, load current passes through sampling
Resistance produces pressure drop, and the grid of first switch pipe Q01 (N-channel field-effect tube) obtains forward voltage conducting so that second switch
Pipe Q02 (P-channel field-effect transistor (PEFT) pipe) is also switched on, li-ion cell protection control circuit energization work, meanwhile, li-ion cell protection control circuit
Output drive signal iQ1, whole li-ion cell protection control circuit obtain electric normal work；
When loading RL disconnections, load current zero, the grid no-voltage of first switch pipe Q01, the cut-off of first switch pipe,
Then, second switch pipe Q02 is also switched off, the power-off of li-ion cell protection control circuit, i.e. battery is under no-load condition, whole protection electricity
Roadbed originally not power consumption.
However, in real work, load current can be sent out from kilo-ampere to several milliamperes, in the range of even several microamperes
Changing, can not be in all changes only with the sampling resistor (sample resistance is only several milliohms under normal conditions) of a fixed value
That protection circuit is realized in the case of the load current value of change smoothly obtains electric work.As shown in fig. 6, when protection circuit is in load current
When extremely small (only several milliamperes or several microamperes), the pressure drop at transistor Q1 both ends is substantially zeroed at this time, the
The grid potential of one switching tube Q01 is unable to reach its cut-in voltage value, and (cut-in voltage of usual first switch pipe is in several volts of zero point
To three ten-day period of hot season scope), after first switch pipe Q01 ends, second switch pipe Q02 is also switched off, so as to cause li-ion cell protection control
Circuit can not obtain electric work；If sample resistance is selected larger to ensure that the conducting of circuit (in order to reduce circuit power consumption, usually takes
Sample resistance is not too large), then whole circuit can produce larger power consumption because of the presence of big resistance, this is again electric with li-ion cell protection
The design concept that the requirement power consumption on road is the smaller the better is runed counter to.
Therefore, how in the case of load current very little, the normal work of circuit is ensured, and can be in large load current
In the case of reduce circuit power consumption be in current lithium battery charge and discharge protective circuit design urgent problem to be solved, it is necessary to existing
Scheme make further improvement.
The content of the invention
First technical problem to be solved by this invention is to provide a kind of structure letter for above-mentioned state of the art
The switching transistor pressure drop that be able to maintain that singly and under minor load electric current transistor both ends has setting voltage drop value all the time is kept
Circuit.
Second technical problem to be solved by this invention is provided a kind of using upper for above-mentioned state of the art
State the low-power consumption lithium battery charge and discharge protective circuit of switching transistor pressure drop holding circuit.
Technical solution is used by the present invention solves above-mentioned first technical problem：A kind of switching transistor pressure drop is kept
Circuit, includes the first field-effect tube of N-channel, and the drain electrode of first field-effect tube and source electrode are serially connected on load circuit, its
It is characterized in that：The pressure drop holding circuit is set with a reference voltage, which includes first input end, second
Input, output end and ground terminal, wherein, the first input end of the pressure drop holding circuit connects first field-effect tube
Drain electrode, the second input terminal of the pressure drop holding circuit is connected with the drive signal of li-ion cell protection control circuit output, described
The output terminal of pressure drop holding circuit connects the grid of first field-effect tube, and the ground terminal of the pressure drop holding circuit directly connects
Ground；Also, there is following logical relation between the input terminal and output terminal of the pressure drop holding circuit：
When the voltage between the first input end and ground terminal is more than the reference voltage, and the second input terminal is low electricity
When flat " 0 ", the output terminal of the pressure drop holding circuit is low level " 0 "；
When the voltage between the first input end and ground terminal is less than the reference voltage, and the second input terminal is low electricity
When flat " 0 ", the output terminal of the pressure drop holding circuit is low level " 0 "；
When the voltage between the first input end and ground terminal is more than the reference voltage, and the second input terminal is high electricity
When flat " 1 ", the output terminal of the pressure drop holding circuit is high level " 1 "；
When the voltage between the first input end and ground terminal is less than the reference voltage, and the second input terminal is high electricity
When flat " 1 ", the output terminal of the pressure drop holding circuit is low level " 0 ".
Preferably, the pressure drop holding circuit can be specially：Include the second field-effect tube of N-channel and the second ratio
Compared with device, wherein, the negative input of second comparator is connected with the drain electrode of first field-effect tube, and described second compares
The electrode input end of device is grounded after the second reference voltage, the source electrode ground connection of first field-effect tube；Described second compares
The output terminal of device is connected with the grid of second field-effect tube, and the drain electrode of second field-effect tube is imitated with described first all the way
Should the grid of pipe be connected, another way is connected with the drive signal of the li-ion cell protection control circuit output, second effect
Should pipe source electrode ground connection.
As it is another preferably, the pressure drop holding circuit can also be specially：Include the 3rd field-effect tube of P-channel and
3rd comparator, wherein, the negative input of the 3rd comparator is connected with the drain electrode of first field-effect tube, and described
The electrode input end of three comparators is grounded after the 3rd reference voltage, the source electrode ground connection of first field-effect tube；Described
The output terminal of three comparators is connected with the grid of the 3rd field-effect tube, source electrode and the lithium battery of the 3rd field-effect tube
The drive signal of protection control circuit output is connected, the drain electrode of the 3rd field-effect tube and the grid phase of first field-effect tube
Even.
Technical solution is used by the present invention solves above-mentioned second technical problem：The lithium battery protection circuit includes
Protection control circuit, battery, N-channel first switch pipe, the P-channel second of the controllable protection control circuit on/off are opened
Guan Guan, first comparator, the second comparator, the first field-effect tube of N-channel, the second field-effect tube of N-channel, resistance and capacitance, should
Protect control circuit that there is the trigger output end of exportable drive signal；Wherein, the grid of the first switch pipe and described
The drain electrode of one field-effect tube is connected, and the drain electrode of the first switch pipe is connected with the grid of the second switch pipe, the first switch
The source electrode ground connection of pipe；Drain electrode of the negative input of the first comparator all the way with first field-effect tube is connected, another
Road connects one end of load；The other end of the load connects the second switch pipe through the battery ground, another way all the way
Source electrode；The electrode input end of the first comparator is grounded after the first reference voltage；The output terminal warp of the first comparator
The grid of the second switch pipe is connected after the resistance all the way, another way is through the capacity earth；The second switch pipe
Drain electrode is grounded after the protection control circuit；The leakage of the negative input of second comparator and first field-effect tube
Extremely it is connected, the electrode input end of second comparator is grounded after the second reference voltage, the source of first field-effect tube
Pole is grounded；The output terminal of second comparator is connected with the grid of second field-effect tube, the leakage of second field-effect tube
Grid of the pole all the way with first field-effect tube is connected, and another way is connected with the trigger output end of the protection control circuit；
The source electrode ground connection of second field-effect tube；Also, the pressure drop of first reference voltage is less than the pressure drop of the second reference voltage.
As it is another preferably, the lithium battery protection circuit include protection control circuit, battery, N-channel first switch pipe,
The P-channel second switch pipe of the controllable protection control circuit on/off, first comparator, the 3rd comparator, N-channel the
One field-effect tube, the 3rd field-effect tube of P-channel, resistance and capacitance, the protection control circuit have touching for exportable drive signal
Send out output terminal；Wherein, the drain electrode of the grid of the first switch pipe and first field-effect tube is connected, the first switch pipe
Drain electrode is connected with the grid of the second switch pipe, the source electrode ground connection of the first switch pipe；The anode of the first comparator is defeated
Enter drain electrode of the end all the way with first field-effect tube to be connected, another way connects one end of load；The other end of the load is all the way
Through the battery ground, another way connects the source electrode of the second switch pipe；The electrode input end of the first comparator passes through
It is grounded after first reference voltage；The output terminal of the first comparator connects the second switch pipe all the way after the resistance
Grid, another way is through the capacity earth；The drain electrode of the second switch pipe is grounded after the protection control circuit；Described
The negative input of three comparators is connected with the drain electrode of first field-effect tube, the electrode input end warp of the 3rd comparator
It is grounded after crossing the 3rd reference voltage, the source electrode ground connection of first field-effect tube；The output terminal of 3rd comparator with it is described
The grid of 3rd field-effect tube is connected, the source electrode of the 3rd field-effect tube and the trigger output end phase of the protection control circuit
Even, the drain electrode of the 3rd field-effect tube is connected with the grid of first field-effect tube；Also, the pressure of first reference voltage
Pressure drop of the drop less than the 3rd reference voltage.
The second field-effect tube and the 3rd field-effect tube in above-mentioned two lithium battery protection circuit can be substituted for three respectively
Pole pipe, correspondingly, grid, source electrode and the drain electrode of field-effect tube are replaced by the base stage of corresponding triode, emitter and collector respectively
Generation.
Compared with prior art, the advantage of the invention is that：The input terminal for the pressure drop holding circuit that the present invention designs, output
There is certain logical relation between end and reference voltage, the pressure drop holding circuit is simple in structure, and whole circuit passes through comparator
Realized with switching transistor, can ensure first be serially connected in load circuit in the case where load current is extremely small
There is the voltage drop value of setting all the time on effect pipe, and then ensure the normal power-up work of whole li-ion cell protection control circuit.
Brief description of the drawings
Fig. 1 is the functional block diagram of the switching transistor pressure drop holding circuit of the present invention.
Fig. 2 is one of specific line map of switching transistor pressure drop holding circuit of the present invention.
Fig. 3 is application of the pressure drop holding circuit in lithium battery charge and discharge protective circuit shown in Fig. 2.
Fig. 4 is the two of the specific line map of the switching transistor pressure drop holding circuit of the present invention.
Fig. 5 is application of the pressure drop holding circuit in lithium battery charge and discharge protective circuit shown in Fig. 4.
Fig. 6 is the line assumption diagram of lithium battery charge and discharge protective circuit of the prior art.
Embodiment
The present invention is described in further detail below in conjunction with attached drawing embodiment.
As shown in Figure 1, being the switching transistor pressure drop holding circuit schematic diagram of the present invention, switching transistor pressure drop keeps electricity
Road T1 can be in the case of load current very little, and the switching transistor for ensureing to be serially connected on load circuit can maintain to set all the time
Fixed voltage drop value.
The switching transistor pressure drop holding circuit T1 of the present invention includes N-channel the first field-effect tube Q1, the first field-effect
The drain electrode of pipe Q1 is serially connected on load circuit with source electrode, and a reference voltage is set with pressure drop holding circuit T1, which keeps
Circuit T1 includes first input end A, the second input terminal B, output terminal D and ground terminal G, wherein, the of pressure drop holding circuit T1
The drain electrode of one input terminal A the first field-effect tube of connection Q1, the second input terminal B and the li-ion cell protection of pressure drop holding circuit T1 control
The drive signal iQ1 of circuit output is connected, the grid of output terminal D the first field-effect tube of connection Q1 of pressure drop holding circuit T1, pressure
The ground terminal G of drop holding circuit T1 is directly grounded, source electrode (after generally going through a sample resistance) ground connection of the first field-effect tube Q1；
Also, there is following logical relation between the input terminal and output terminal of pressure drop holding circuit T1：
When the voltage of first input end A and ground terminal G are more than reference voltage, and the second input terminal B is low level " 0 ",
The output terminal D of pressure drop holding circuit is low level " 0 "；
When the voltage of first input end A and ground terminal G are less than reference voltage, and the second input terminal B is low level " 0 ",
The output terminal D of pressure drop holding circuit is low level " 0 "；
When the voltage of first input end A and ground terminal G are more than reference voltage, and the second input terminal B is high level " 1 ",
The output terminal D of pressure drop holding circuit is high level " 1 "；
When the voltage of first input end A and ground terminal G are less than reference voltage, and the second input terminal B is high level " 1 ",
The output terminal D of pressure drop holding circuit is low level " 0 ".
When the second input terminal B is low level, no matter whether the voltage between first input end A and ground terminal G is more than interior
The reference voltage of portion's setting, then the output terminal D of pressure drop holding circuit T1 exports as low level all the time, and the first field-effect tube Q1
By；Only when the second input terminal B is high level, it is less than the base of inner setting in the voltage of first input end A and ground terminal G
Under quasi- voltage condition, the output terminal D of pressure drop holding circuit is transformed to low level " 0 " by high level " 1 ", so that first effect
Should pipe Q1 drain potential rise, ensure to be able to maintain that the voltage drop value of setting between the drain electrode of the first field-effect tube Q1 and source electrode.
Embodiment one, as shown in Figure 2 and Figure 3：
The switching transistor pressure drop holding circuit T1 of the present embodiment one is specially：Include the second field-effect tube of N-channel Q2
With the second comparator BG2, wherein, the negative input of the second comparator BG2 is connected with the drain electrode of the first field-effect tube Q1, second
The electrode input end of comparator BG2 is grounded after the second reference voltage E2, the source electrode ground connection of the first field-effect tube Q1；Second ratio
Output terminal compared with device BG2 is connected with the grid of the second field-effect tube Q2, the drain electrode of second field-effect tube Q2 all the way with first
The grid of effect pipe Q1 is connected, and another way is connected with the drive signal iQ1 of li-ion cell protection control circuit output, the second field-effect
The source electrode ground connection of pipe Q2.
Fig. 3 is the switching transistor pressure drop holding circuit T1 of the present embodiment one specifically should in lithium battery protection circuit
With it (can also be NPN type that the lithium battery protection circuit, which includes protection control circuit, battery DC, N-channel first switch pipe Q01,
Triode), the P-channel second switch pipe Q02 (can also be PNP type triode) of controllable protection control circuit on/off,
It is set with the first comparator BG1 of the first reference voltage E1, is set with the second comparator BG2, the N-channel of the second reference voltage E2
Second field-effect tube Q2, resistance R and capacitance C, the protection control circuit have the trigger output end of exportable drive signal iQ1,
Also, the first reference voltage E1 is less than the second reference voltage E2；
Wherein, the drain electrode of the grid of first switch pipe Q01 and the first field-effect tube Q1 is connected, first switch pipe Q01's
Drain electrode is connected with the grid of second switch pipe Q02, the source electrode ground connection of first switch pipe Q01；The anode of first comparator BG1 is defeated
Enter drain electrode of the end all the way with the first field-effect tube Q1 to be connected, another way connects one end of load RL；The other end of load RL passes through all the way
Battery DC is grounded, the source electrode of another way connection second switch pipe Q02；The electrode input end of first comparator BG1 is through the first benchmark
It is grounded after voltage；The output terminal of first comparator BG1 connects the grid of second switch pipe Q02, another way warp all the way after resistance R
Capacitance C is grounded；The drain electrode of second switch pipe Q02 is grounded after protecting control circuit；The negative input of second comparator BG2 with
The drain electrode of first field-effect tube Q1 is connected, and the electrode input end of the second comparator BG2 is grounded after the second reference voltage, and first
The source electrode ground connection of field-effect tube Q1；The output terminal of second comparator BG2 is connected with the grid of the second field-effect tube Q2, this second
Grid of the drain electrode of effect pipe Q2 all the way with the first field-effect tube Q1 is connected, the trigger output end of another way and protection control circuit
It is connected；The source electrode ground connection of second field-effect tube Q2.
Field-effect tube in above-described embodiment one could alternatively be triode, correspondingly, grid, the source electrode of field-effect tube
Substituted respectively by the base stage of corresponding triode, emitter and collector with drain electrode.
The lithium battery protection circuit operation principle of embodiment one is：When load RL is connected moment, protection control circuit is in
" dormancy " state, no drive signal iQ1 outputs, the first field-effect tube Q1 are in cut-off state, its electricity to drain between source electrode
Pressure is almost the supply voltage of battery DC, and the grid of first switch pipe Q01 obtains forward voltage and turns on, second switch pipe Q02
Turn on therewith.
Then, control circuit and first comparator BG1, the second comparator BG2 is protected to obtain electric work, meanwhile, protection
Control circuit output drive signal iQ1；If drive signal iQ1 is high level at this time and load current is in the first field-effect tube Q1
The pressure drop produced in internal resistance (and sample resistance) is more than the first reference voltage E1, and (the first reference voltage E1 can be set as millivolt level
It is even lower), then first comparator BG1 exports low level, and second switch pipe Q02 will be in the conduction state all the time, protection control
Circuit normally obtains electric work.
If load current very little (only several milliamperes or even several microamperes), cause drain electrode and the ground of the first field-effect tube Q1
Between pressure drop be less than pressure drop holding circuit T1 setting the second reference voltage E2 when, then the second comparator BG2 anode input
Voltage between end and ground is less than the electrode input end voltage of second comparator BG2, and the second comparator BG2 exports high level,
Second field-effect tube Q2 is turned on, and the grid potential of the first field-effect tube Q1 is dragged down, then, the drain electrode electricity of the first field-effect tube Q1
Position rise；When the drain potential of the first field-effect tube Q1 is risen to more than the second reference voltage E2, the second comparator BG2 outputs are low
Level, the second field-effect tube Q2 cut-offs, under the action of drive signal iQ1, drain potential reduces the first field-effect tube Q1.
The pressure drop over the ground of first field-effect tube Q1, can be maintained at voltage drop value (i.e. the second benchmark electricity of setting by so circulation
Press E2)；Since the first reference voltage E1 of setting is less than the second reference voltage E2, the anode input of first comparator BG1
The current potential at end is consistently higher than the current potential of electrode input end, i.e. the output terminal of first comparator BG1 is always low level, then second opens
It is in the conduction state all the time to close pipe Q02, it is ensured that protection control circuit, can in the case of load current size arbitrarily change
Obtain the reliable power supply of battery DC.
In the case where loading RL disconnections, load current zero, the pressure drop between the drain electrode of the first field-effect tube Q1 and ground is
Zero, first switch pipe Q01 end, first comparator BG1 output high level, second switch pipe Q02 cut-off, protection control circuit and
First comparator BG1, the second comparator BG2 are powered off, and the first field-effect tube Q1 cut-offs, then, entirely protect control circuit " to stop
Sleep " not power consumption.
Embodiment two, as shown in Figure 4, Figure 5：
The pressure drop holding circuit T1 of the present embodiment two is specially：Include P-channel the 3rd field-effect tube Q3 and the 3rd to compare
Device BG3, wherein, the negative input of the 3rd comparator BG3 is connected with the drain electrode of the first field-effect tube Q1, the 3rd comparator BG3
Electrode input end be grounded after the 3rd reference voltage E3, the source electrode of the first field-effect tube Q1 ground connection；3rd comparator BG3's
Output terminal is connected with the grid of the 3rd field-effect tube Q3, and the source electrode and li-ion cell protection control circuit of the 3rd field-effect tube Q3 is defeated
The drive signal iQ1 gone out is connected, and the drain electrode of the 3rd field-effect tube Q3 is connected with the grid of the first field-effect tube Q1.
Fig. 5 is applications of the switching transistor pressure drop holding circuit T1 of the present embodiment two in lithium battery protection circuit, should
It (can also be three pole of NPN type that lithium battery protection circuit, which includes protection control circuit, battery DC, N-channel first switch pipe Q01,
Pipe), the P-channel second switch pipe Q02 (can also be PNP type triode) of controllable protection control circuit on/off, set
There is the first comparator BG1 of the first reference voltage E1, be set with the 3rd comparator BG3, the P-channel the 3rd of the 3rd reference voltage E3
Field-effect tube Q3, resistance R and capacitance C, the protection control circuit have the trigger output end of output drive signal iQ1；
Wherein, the drain electrode of the grid of first switch pipe Q01 and the first field-effect tube Q1 is connected, first switch pipe Q01's
Drain electrode is connected with the grid of second switch pipe Q02, the source electrode ground connection of first switch pipe Q01；The anode of first comparator BG1 is defeated
Enter drain electrode of the end all the way with the first field-effect tube Q1 to be connected, another way connects one end of load RL；The other end of load RL passes through all the way
Battery DC is grounded, the source electrode of another way connection second switch pipe Q02；The electrode input end of first comparator BG1 passes through the first base
It is grounded after quasi- voltage；The output terminal of first comparator BG1 connects the grid of second switch pipe Q02, another way all the way after resistance R
It is grounded through capacitance C；The drain electrode of second switch pipe Q02 is grounded after protecting control circuit；The negative input of 3rd comparator BG3
Drain electrode with the first field-effect tube Q1 is connected, and the electrode input end of the 3rd comparator BG3 is grounded after the 3rd reference voltage E3,
The source electrode ground connection of first field-effect tube Q1；The output terminal of 3rd comparator BG3 is connected with the grid of the 3rd field-effect tube Q3, this
The source electrode of three field-effect tube Q3 is with protecting the trigger output end of control circuit to be connected, the drain electrode and first of the 3rd field-effect tube Q3
The grid of field-effect tube Q1 is connected.
Field-effect tube in above-described embodiment two could alternatively be triode, correspondingly, grid, the source electrode of field-effect tube
Substituted respectively by the base stage of corresponding triode, emitter and collector with drain electrode.
The lithium battery protection circuit operation principle of embodiment two is：When load RL is connected moment, protection control circuit is in
" dormancy " state, no drive signal iQ1 outputs, the first field-effect tube Q1 are in cut-off state, its electricity to drain between source electrode
Pressure is almost the supply voltage of battery DC, and the grid of first switch pipe Q01 obtains forward voltage and turns on, second switch pipe Q02
Turn on therewith.
Then, control circuit and first comparator BG1, the 3rd comparator BG3 is protected to obtain electric work, at this time, if
Load current is sufficiently large, and the voltage between the negative input and ground of the 3rd comparator BG3 is more than the 3rd comparator BG3 cathodes
Input terminal voltage, the 3rd comparator BG3 output low levels, the 3rd field-effect tube Q3 conductings, meanwhile, protection control circuit output is driven
Dynamic signal iQ1；If iQ1 is driven at this time as high level and load current is in the first field-effect tube Q1 internal resistances (and sample resistance)
The pressure drop of generation is more than the first reference voltage E1 (it is even lower that the first reference voltage E1 can be set as millivolt level), then the first ratio
Low level is exported compared with device BG1, second switch pipe Q02 will be in the conduction state all the time, and protection control circuit normally obtains electric work.
If load current very little (only several milliamperes or even several microamperes), cause drain electrode and the ground of the first field-effect tube Q1
Between pressure drop be less than pressure drop holding circuit T1 setting the 3rd reference voltage E3 when, then the 3rd comparator BG3 anode input
Voltage between end and ground is less than the electrode input end voltage of the 3rd comparator BG3, and the 3rd comparator BG3 exports high level,
3rd field-effect tube Q3 cut-offs (i.e. circuit disconnects between the grid of drive signal iQ1 and the first field-effect tube Q1), by first
The grid potential of effect pipe Q1 drags down, then, the drain potential rise of the first field-effect tube Q1；When the leakage of the first field-effect tube Q1
When electrode potential is risen to more than the 3rd reference voltage E3, the 3rd comparator BG3 output low levels, the 3rd field-effect tube Q3 is led again
Logical, under the action of drive signal iQ1, drain potential reduces the first field-effect tube Q1.
The pressure drop over the ground of first field-effect tube Q1, can be maintained at voltage drop value (i.e. the 3rd benchmark electricity of setting by so circulation
Press E3)；Since the first reference voltage E1 of setting is less than the 3rd reference voltage E3, the anode input of first comparator BG1
The current potential at end is consistently higher than the current potential of electrode input end, i.e. the output terminal of first comparator BG1 is always low level, then second opens
It is in the conduction state all the time to close pipe Q02, it is ensured that protection control circuit, can in the case of load current size arbitrarily change
Obtain the reliable power supply of battery DC.
In the case where loading RL disconnections, load current zero, the pressure drop between the drain electrode of the first field-effect tube Q1 and ground is
Zero, first switch pipe Q01 end, first comparator BG1 output high level, second switch pipe Q02 cut-off, protection control circuit and
First comparator BG1, the 3rd comparator BG3 are powered off, and the first field-effect tube Q1 cut-offs, then, entirely protect control circuit " to stop
Sleep " not power consumption.
Claims (7)
1. a kind of switching transistor pressure drop holding circuit, includes the first field-effect tube of N-channel, the leakage of first field-effect tube
Pole and source electrode are serially connected on load circuit, it is characterised in that：The pressure drop holding circuit is set with a reference voltage, which protects
Hold circuit and include first input end, the second input, output end and ground terminal, wherein, the first of the pressure drop holding circuit
Input terminal connects the drain electrode of first field-effect tube, and the second input terminal and the li-ion cell protection of the pressure drop holding circuit control
The drive signal of circuit output is connected, and the output terminal of the pressure drop holding circuit connects the grid of first field-effect tube, institute
The source electrode ground connection of the first field-effect tube is stated, the ground terminal of the pressure drop holding circuit is directly grounded；Also, the pressure drop keeps electricity
There is following logical relation between the input terminal and output terminal on road：
When the voltage between the first input end and ground terminal is more than the reference voltage, and the second input terminal is low level
When " 0 ", the output terminal of the pressure drop holding circuit is low level " 0 "；
When the voltage between the first input end and ground terminal is less than the reference voltage, and the second input terminal is low level
When " 0 ", the output terminal of the pressure drop holding circuit is low level " 0 "；
When the voltage between the first input end and ground terminal is more than the reference voltage, and the second input terminal is high level
When " 1 ", the output terminal of the pressure drop holding circuit is high level " 1 "；
When the voltage between the first input end and ground terminal is less than the reference voltage, and the second input terminal is high level
When " 1 ", the output terminal of the pressure drop holding circuit is low level " 0 ".
2. switching transistor pressure drop holding circuit according to claim 1, it is characterised in that：The pressure drop holding circuit
Specially：Include the second field-effect tube of N-channel and the second comparator, wherein, the negative input of second comparator with
The drain electrode of first field-effect tube is connected, and the electrode input end of second comparator is grounded after the second reference voltage,
The source electrode ground connection of first field-effect tube；The output terminal of second comparator and the grid phase of second field-effect tube
Even, grid of the drain electrode of second field-effect tube all the way with first field-effect tube is connected, another way and li-ion cell protection control
The drive signal of circuit output processed is connected, the source electrode ground connection of second field-effect tube.
3. switching transistor pressure drop holding circuit according to claim 1, it is characterised in that：The pressure drop holding circuit
Specially：Include the 3rd field-effect tube of P-channel and the 3rd comparator, wherein, the negative input of the 3rd comparator with
The drain electrode of first field-effect tube is connected, and the electrode input end of the 3rd comparator is grounded after the 3rd reference voltage,
The source electrode ground connection of first field-effect tube；The output terminal and the grid phase of the 3rd field-effect tube of 3rd comparator
Even, the source electrode of the 3rd field-effect tube is connected with the drive signal of li-ion cell protection control circuit output, the 3rd field-effect tube
Drain electrode be connected with the grid of first field-effect tube.
A kind of 4. lithium battery protection circuit, it is characterised in that：The lithium battery protection circuit includes protection control circuit, battery, N
Raceway groove first switch pipe, the P-channel second switch pipe of the controllable protection control circuit on/off, first comparator, the
Two comparators, the first field-effect tube of N-channel, the second field-effect tube of N-channel, resistance and capacitance, which has can
The trigger output end of output drive signal；
Wherein, the drain electrode of the grid of the first switch pipe and first field-effect tube is connected, the drain electrode of the first switch pipe
It is connected with the grid of the second switch pipe, the source electrode ground connection of the first switch pipe；The negative input of the first comparator
The drain electrode with first field-effect tube is connected all the way, and another way connects one end of load；The other end of the load is all the way through institute
Battery ground is stated, another way connects the source electrode of the second switch pipe；The electrode input end of the first comparator is through the first base
It is grounded after quasi- voltage；The output terminal of the first comparator connects the grid of the second switch pipe all the way after the resistance,
Another way is through the capacity earth；The drain electrode of the second switch pipe is grounded after the protection control circuit；Second ratio
Drain electrode compared with the negative input and first field-effect tube of device is connected, and the electrode input end of second comparator is by the
It is grounded after two reference voltages, the source electrode ground connection of first field-effect tube；The output terminal of second comparator and described second
The grid of field-effect tube is connected, and the grid to drain all the way with first field-effect tube of second field-effect tube is connected, another
Road is connected with the trigger output end of the protection control circuit；The source electrode ground connection of second field-effect tube；Also, described first
The pressure drop of reference voltage is less than the pressure drop of the second reference voltage.
5. lithium battery protection circuit according to claim 4, it is characterised in that：Second field-effect tube is three poles
Pipe, correspondingly, grid, source electrode and the drain electrode of second field-effect tube are respectively by the base stage of the triode, emitter sum aggregate
Electrode substitutes.
A kind of 6. lithium battery protection circuit, it is characterised in that：The lithium battery protection circuit includes protection control circuit, battery, N
Raceway groove first switch pipe, the P-channel second switch pipe of the controllable protection control circuit on/off, first comparator, the
Three comparators, the first field-effect tube of N-channel, the 3rd field-effect tube of P-channel, resistance and capacitance, which has can
The trigger output end of output drive signal；
Wherein, the drain electrode of the grid of the first switch pipe and first field-effect tube is connected, the drain electrode of the first switch pipe
It is connected with the grid of the second switch pipe, the source electrode ground connection of the first switch pipe；The negative input of the first comparator
The drain electrode with first field-effect tube is connected all the way, and another way connects one end of load；The other end of the load is all the way through institute
Battery ground is stated, another way connects the source electrode of the second switch pipe；The electrode input end of the first comparator passes through first
It is grounded after reference voltage；The output terminal of the first comparator connects the grid of the second switch pipe all the way after the resistance
Pole, another way is through the capacity earth；The drain electrode of the second switch pipe is grounded after the protection control circuit；Described 3rd
The negative input of comparator is connected with the drain electrode of first field-effect tube, and the electrode input end of the 3rd comparator passes through
It is grounded after 3rd reference voltage, the source electrode ground connection of first field-effect tube；The output terminal of 3rd comparator and described the
The grid of three field-effect tube is connected, and the source electrode of the 3rd field-effect tube is connected with the trigger output end of the protection control circuit,
The drain electrode of 3rd field-effect tube is connected with the grid of first field-effect tube；Also, the pressure drop of first reference voltage
Less than the pressure drop of the 3rd reference voltage.
7. lithium battery protection circuit according to claim 6, it is characterised in that：3rd field-effect tube is three poles
Pipe, correspondingly, grid, source electrode and the drain electrode of the 3rd field-effect tube are respectively by the base stage of the triode, emitter sum aggregate
Electrode substitutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510557034.5A CN105048422B (en) | 2015-09-02 | 2015-09-02 | Switching transistor pressure drop holding circuit and application have the lithium battery protection circuit of the pressure drop holding circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510557034.5A CN105048422B (en) | 2015-09-02 | 2015-09-02 | Switching transistor pressure drop holding circuit and application have the lithium battery protection circuit of the pressure drop holding circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105048422A CN105048422A (en) | 2015-11-11 |
| CN105048422B true CN105048422B (en) | 2018-05-08 |
Family
ID=54454747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510557034.5A Active CN105048422B (en) | 2015-09-02 | 2015-09-02 | Switching transistor pressure drop holding circuit and application have the lithium battery protection circuit of the pressure drop holding circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105048422B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10020809B2 (en) * | 2016-09-19 | 2018-07-10 | Globalfoundries Inc. | Integrated level translator and latch for fence architecture |
| CN108327876A (en) * | 2018-02-22 | 2018-07-27 | 陈蜀乔 | There is the magnetic current propulsion system for pushing away water groove in a kind of submariner device outer surface |
| CN109245507B (en) * | 2018-11-08 | 2024-02-09 | 上海艾为电子技术股份有限公司 | Overshoot-preventing protection circuit |
| CN110011378A (en) * | 2019-04-19 | 2019-07-12 | 深圳市山河动力电子有限公司 | A kind of lithium battery protection board overcurrent detection protection circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071950A (en) * | 2006-05-09 | 2007-11-14 | 罗姆股份有限公司 | Charging circuit, over-voltage protection circuit |
| CN205070409U (en) * | 2015-09-02 | 2016-03-02 | 何岳明 | Switch transistor pressure drop holding circuit and applied this pressure drop holding circuit's lithium battery protection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6485540A (en) * | 1987-09-24 | 1989-03-30 | Nec Corp | Power supply control circuit |
-
2015
- 2015-09-02 CN CN201510557034.5A patent/CN105048422B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071950A (en) * | 2006-05-09 | 2007-11-14 | 罗姆股份有限公司 | Charging circuit, over-voltage protection circuit |
| CN205070409U (en) * | 2015-09-02 | 2016-03-02 | 何岳明 | Switch transistor pressure drop holding circuit and applied this pressure drop holding circuit's lithium battery protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105048422A (en) | 2015-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204721079U (en) | Dual-power automatic switching and charging circuit | |
| CN105048422B (en) | Switching transistor pressure drop holding circuit and application have the lithium battery protection circuit of the pressure drop holding circuit | |
| CN105811502B (en) | A kind of modified lithium battery group management circuit based on OZ8952 chip | |
| CN104426138A (en) | Over-discharge protection circuit of chargeable battery | |
| CN104218558B (en) | Anti-surging high tension protection circuit | |
| CN206099459U (en) | A activation circuit for battery management system | |
| WO2017020782A1 (en) | Battery charging and discharging control circuit and battery charging and discharging system | |
| CN105515159A (en) | Solar energy controller power source circuit | |
| CN108110835B (en) | Low-power consumption control circuit for high-voltage battery system | |
| WO2023016574A1 (en) | Switching circuit, battery management system, battery pack, electrical device and control method | |
| CN105978064B (en) | A kind of self-locking battery, which is crossed, puts overcharge protection circuit and lamps and lanterns | |
| CN103956721A (en) | Battery explosion-proof circuit and battery charging circuit | |
| CN103326433B (en) | Powering portable devices control circuit and portable monitor | |
| CN203456941U (en) | Efficient battery and external power supply automatic switching circuit having multiple protection function | |
| CN102545163A (en) | Battery discharge protection circuit and LED (Light Emitting Diode) lamp | |
| CN205070409U (en) | Switch transistor pressure drop holding circuit and applied this pressure drop holding circuit's lithium battery protection circuit | |
| CN104242252A (en) | Battery over-discharge protecting circuit | |
| CN207705835U (en) | A kind of low power consumpting controling circuit for high-voltage battery system | |
| CN207896684U (en) | A kind of pulse activation and dormant circuit | |
| CN105356736A (en) | Laser power supply storage energy discharge system | |
| CN206564464U (en) | A kind of current foldback circuit without sample resistance | |
| CN206727724U (en) | Active and standby dc source with defencive function | |
| CN206790150U (en) | One kind is with anti-reverse external mobile battery over-discharge protection circuit | |
| CN206060238U (en) | A kind of charging active circuit of lithium battery | |
| CN205791790U (en) | The main power supply circuits of Remote control electronic lock and stand-by power supply circuit switch protecting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180621 Address after: 315181 Shui Jia village, Heng Jie Town, Haishu District, Ningbo, Zhejiang Patentee after: Ningbo Tianhong Electronics Co., Ltd. Address before: 315181 Ningbo Tianhong Electronics Co., Ltd., Yinzhou District, Ningbo, Zhejiang Patentee before: He Yueming |