CN101282036A - Overcurrent protection circuit for discharging electricity - Google Patents
Overcurrent protection circuit for discharging electricity Download PDFInfo
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- CN101282036A CN101282036A CNA2008101134065A CN200810113406A CN101282036A CN 101282036 A CN101282036 A CN 101282036A CN A2008101134065 A CNA2008101134065 A CN A2008101134065A CN 200810113406 A CN200810113406 A CN 200810113406A CN 101282036 A CN101282036 A CN 101282036A
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- 230000004224 protection Effects 0.000 title claims abstract description 86
- 238000007599 discharging Methods 0.000 title claims abstract description 55
- 230000005611 electricity Effects 0.000 title claims description 25
- 230000005669 field effect Effects 0.000 claims description 34
- 230000010355 oscillation Effects 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 7
- 229910052744 lithium Inorganic materials 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims 2
- 230000003111 delayed effect Effects 0.000 claims 1
- 208000028659 discharge Diseases 0.000 description 115
- 239000003990 capacitor Substances 0.000 description 8
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009784 over-discharge test Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910018095 Ni-MH Inorganic materials 0.000 description 1
- 229910018477 Ni—MH Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention provides a discharge overflow protection circuit which is characterized in that the invention comprises a discharge overflow comparator and a press control oscillating circuit, wherein, the two inputs of the discharge overflow comparator are a discharge overflow voltage threshold value and a discharge overflow voltage, the output terminals are connected to the enable control terminals of the press control oscillating circuit for judging whether appearing overcurrent state and starting the press control oscillating circuit when appearing the overcurrent state; the press control oscillating circuit comprises an input terminal for receiving the discharge overflow voltage, the enable control terminal receiving the discharge overflow comparator output and an output terminal for outputting the oscillating signal, for generating an oscillating period and an oscillating signal proportionable to the discharge overflow voltage, the discharge overflow protection is performed based on the oscillating signal. The discharge current delay time of the discharge overflow protection circuit is in the inverse ratio of the discharge current, namely realizing the discharge overflow protection time continuous return, thereby improving the security of cells for performing multiple charging and discharging in the discharging state.
Description
Technical field
The present invention relates to a kind of lithium battery protection circuit, relate in particular to the overcurrent protection circuit for discharging electricity in the lithium battery protection circuit.
Background technology
Current, because lithium ion battery does not have memory effect, thereby in increasing electronic system, substitute traditional Ni-MH battery gradually, become main power supply in the mancarried electronic aid.But there are many safety issues in lithium battery, easily blast.So, in lithium battery system, all have complicated protective circuit, to guarantee that preventing dangerous situation under various fortuitous events causes battery to damage.Protective circuit in the lithium battery generally comprises charging overvoltage protection, discharge overvoltage protection, charging overcurrent protection, discharge overcurrent protection and short-circuit protection.
The discharge overcurrent protection is meant that when battery passed through load discharge, discharging current surpassed certain associated voltage threshold value V
EDI, and this state continuance surpasses certain time of delay of T
EDI, battery protecting circuit can turn-off discharge path to forbid discharge, enters discharge overcurrent protection state.When increasing further to, discharging current surpasses relevant short-circuit protection voltage threshold V
SC, and this state continuance surpasses certain time of delay of T
SCThe time, battery protecting circuit can turn-off discharge path to forbid discharge, enters the short-circuit protection state.The short-circuit protection state is same kind of state with discharge overcurrent protection state to control circuit, and its circuit performance all is to forbid discharge.Too, the voltage difference that all to be the voltage that detects the VM end hold with G is less than V when it withdraws from for above-mentioned two kinds of guard modes
EDIThe time, continue through withdrawing from certain time of delay.The main distinction is short-circuit protection threshold value V
SCGreater than V
EDI, and T
SCLess than T
EDI, when just discharging current was excessive, its current value was big more, and time of delay is short more.
In the prior art, generally may set the overcurrent protection of discharging of several discharge overcurrent threshold values and short circuit threshold value.Yet, between above-mentioned several protection threshold values, go back necessary being and other discharge over-current state.Therefore, the discharging current guard time that prior art does not have realization to turn back continuously with discharging current, thus cause the discharge overcurrent protection of above-mentioned intermediateness insufficient.
Summary of the invention
The object of the present invention is to provide a kind of discharging current that can overcome the above problems to be inversely proportional to the overcurrent protection circuit for discharging electricity of discharging current time of delay.
The invention provides a kind of overcurrent protection circuit for discharging electricity, it is characterized in that comprising discharge overcurrent comparator and Voltage-Controlled oscillation circuit, wherein: two of described discharge overcurrent comparator are input as discharge overcurrent voltage and discharge overcurrent voltage threshold (V
EDI), its output is connected to the control end that enables of described Voltage-Controlled oscillation circuit, is used to judge whether to occur over-current state, and starts Voltage-Controlled oscillation circuit when over-current state occurring; Described Voltage-Controlled oscillation circuit comprises the input that receives described discharge overcurrent voltage, the output that enables control end and outputting oscillation signal that receives described discharge overcurrent comparator output; be used to produce a cycle of oscillation and the proportional oscillator signal of described discharge overcurrent voltage, and according to the overcurrent protection of discharging of described oscillator signal.
In yet another embodiment of the present invention, described overcurrent protection circuit for discharging electricity also comprises a timer, is used to receive the oscillator signal of described oscillator, and carries out timing according to described oscillator signal.
In another embodiment of the present invention, a kind of overcurrent protection circuit for discharging electricity also is provided, has it is characterized in that comprising: discharge overcurrent comparator, operational amplifier, first p type field effect transistor, second p type field effect transistor, the 3rd p type field effect transistor, resistance, inverter, first n type field effect transistor, second n type field effect transistor, electric capacity, oscillator comparator, terminals (VCC); Described discharge overcurrent comparator comprises the normal phase input end and the input discharge overcurrent voltage threshold (V of input discharge overcurrent voltage
EDI) inverting input, its output is connected respectively to the input of described inverter and the grid of the 3rd p type field effect transistor; The inverting input of described operational amplifier is imported described discharge overcurrent voltage, its normal phase input end links to each other with the drain electrode of first p type field effect transistor and is connected to an end of described resistance, and its output is connected to the drain electrode of the 3rd p type field effect transistor and the grid of first, second p type field effect transistor; The source electrode of described first, second, third p type field effect transistor is connected to described terminals (VCC), the drain electrode of first p type field effect transistor is connected to an end of described resistance, and the drain electrode of second p type field effect transistor is connected respectively to an end of the drain electrode of first, second n type field effect transistor, described electric capacity and the normal phase input end of described oscillator comparator; The anti-phase reference voltage V that is input as default of described oscillator comparator
REFThe other end ground connection of described resistance; The described first n type field effect transistor source ground, its grid is connected with the output of described oscillator comparator; The grid of described second n type field effect transistor is connected to the other end of described inverter, and the other end of its source electrode and described electric capacity now connects and ground connection.
In another embodiment of the present invention, the electric current that described voltage-controlled current source produces is directly proportional with described discharge overcurrent voltage, and the electric current that described cycle of oscillation and described voltage-controlled current source produce is inversely proportional to.
The invention provides the lithium battery protection circuit that a kind of discharging current is inversely proportional to discharging current time of delay, turn back continuously to realize the discharge overcurrent protection time, thereby improve the fail safe of battery in discharge condition that can repeatedly discharge and recharge.
Description of drawings
Below with reference to accompanying drawings specific embodiments of the present invention is described in detail, in the accompanying drawings:
Fig. 1 is the battery protecting circuit that adopts secondary discharge overcurrent protection;
Fig. 2 is the curve chart that changes with the overdischarge electric current discharge overcurrent time of delay in the circuit shown in Figure 1;
Fig. 3 is the battery protecting circuit that adopts three grades of discharge overcurrent protections;
Fig. 4 is the curve chart that changes with the overdischarge electric current discharge overcurrent time of delay in the circuit shown in Figure 3;
Fig. 5 is according to battery protecting circuit of the present invention;
Fig. 6 is the curve chart that the discharge delay time in the circuit shown in Figure 5 changes with the overdischarge electric current;
Fig. 7 shows the overcurrent protection circuit for discharging electricity that discharge delay time according to the present invention is inversely proportional to discharging current, and
Fig. 8 is the structured circuit figure of circuit shown in Figure 7;
Fig. 9 is the structured circuit figure of circuit shown in Figure 8; And
Figure 10 is the structured circuit figure of circuit shown in Figure 9.
Embodiment
Fig. 1 is the battery protecting circuit that adopts secondary discharge overcurrent protection.
As shown in Figure 1, this circuit comprises the testing circuit that overcharges, overdischarge testing circuit, charging over-current detection circuit, discharge over-current detection circuit, short-circuit protection testing circuit, control circuit and switch MD, MC.Discharge over-current detection circuit and short-circuit protection testing circuit carry out voltage detecting at secondary discharge overcurrent protection, and promptly the voltage by detecting the VM end and the G voltage difference of holding is greater than certain voltage threshold V
EDIJudge whether the overcurrent that discharges.The voltage difference of the voltage of VM end and G end is the conduction voltage drop of switch MD and MC.If the conducting resistance of MD and MC is R
ON_MDAnd R
ON_MC, then the discharging current threshold of Jian Ceing is:
When increasing, discharging current surpasses discharge overcurrent protection threshold value V
EDIThe time, and this state continuance surpasses certain time of delay of T
EDIThe time, battery protecting circuit can turn-off discharge path, forbids discharge, enters discharge overcurrent protection state.
When discharging current is bigger, surpass short-circuit protection threshold value V
SCThe time, and this state continuance surpasses certain time of delay of T
SCThe time, battery protecting circuit can turn-off discharge path, forbids discharge, enters the short-circuit protection state.The short-circuit protection state is same kind of state with discharge overcurrent protection state to control circuit, and its performance all is to forbid discharge.Too, the voltage difference that all to be the voltage that detects the VM end hold with G was less than V when above-mentioned two kinds of guard modes withdrawed from
EDI, and continue through withdrawing from guard mode certain time of delay.Both main distinctions are short-circuit protection threshold value V
SCGreater than V
EDI, and T
SCLess than T
EDI, shorten time of delay when just discharging current increases.The short circuit current threshold value is determined by following formula:
This is that during for certain cell voltage, the power consumption that produces in the identical time is big more because discharging current is big more, and the heat of generation is big more.The damage of many electronic systems is all because overheated causing.Usually specific system all has certain specific heat of combustion, can calculate the temperature rise that certain heat causes.When temperature rises to certain value, system failure.So need turn back time of delay with discharging current.If cell voltage is V
B, electric current is I
B, then the heat P that produces in certain time interval T is:
P＝V
B.I
B.T
Fig. 2 is the curve chart that changes with the overdischarge electric current discharge overcurrent time of delay in the circuit shown in Figure 1.
As shown in Figure 2, served as discharging current at I
EDI1And I
SCBetween the time, discharge overcurrent time of delay is T
EDI1, served as discharging current and surpassed short circuit current protection threshold value I
SCThe time, the discharge overcurrent becomes T time of delay
SCObviously, I
SC, I
EDI1Value change T from big to small
SC, T
EDIValue change from small to large, promptly the overdischarge current value is big more, the discharge overcurrent short more time of delay.
Fig. 3 is the battery protecting circuit that adopts three grades of discharge overcurrent protections.
Owing to also can go out current bound in I in the real system
EDIAnd I
SCBetween the discharge over-current state, in order to realize protecting more fully, the S8261 of Seiko electronics has adopted tertiary current protection (discharge overcurrent protection 1, discharge overcurrent protection 2 and short-circuit protection), as shown in Figure 3.This circuit comprises the testing circuit that overcharges, overdischarge testing circuit, charging over-current detection circuit, discharge over-current detection circuit 1, discharge over-current detection circuit 2, short-circuit protection testing circuit, control circuit and switch MD, MC.The discharge overcurrent protection principle of this circuit is identical with circuit shown in Figure 1.Its difference is to have added discharge over-current detection circuit 2.Wherein, the threshold value I of discharge overcurrent protection 2
EDI2Threshold value I than discharge overcurrent protection 1
EDI1Height, T time of delay of discharge overcurrent protection 2
EDI2T time of delay than discharge overcurrent protection 1
EDI1Short.So just realized I
EDIAnd I
SCBetween the discharge over-current state protect.
Fig. 4 is the curve chart that changes with the overdischarge electric current discharge overcurrent time of delay in the circuit shown in Figure 3.
As shown in Figure 4, served as discharging current at I
EDI1And I
EDI2Between the time, discharge overcurrent time of delay is T
EDI1Served as discharging current at I
EDI1And I
SCBetween the time, discharge overcurrent time of delay is T
EDI2Serve as discharging current and surpassed short circuit current protection threshold value I
SCThe time, the discharge overcurrent becomes T time of delay
SCObviously, I
SC, I
EDI2, I
EDI1Value change T from big to small
SC, T
EDI2, T
EDI1Value change from small to large, promptly the overdischarge current value is big more, the discharge overcurrent short more time of delay.
Owing to also can go out current bound in I in the real system
EDI1And I
EDI2Between or the boundary in I
EDI2And I
SCBetween any other cross the state of flow valuve, so need protect to the discharge over-current state in the middle of these.In brief, realize the discharge overcurrent protection time turn back continuously exactly, it is turned back, and to close be that the discharge overcurrent is inversely proportional to discharge overcurrent value time of delay.
Fig. 5 is the battery protecting circuit according to the embodiment of the invention.
As shown in Figure 5, this circuit comprises that the testing circuit that overcharges, overdischarge testing circuit, charging over-current detection circuit, time-delay are inversely proportional to discharge over-current detection circuit, control circuit and switch MD, the MC of electric current.Among the figure, the discharge over-current detection circuit that time-delay is inversely proportional to electric current is used for carrying out voltage detecting at the discharge overcurrent protection.The overdischarge electric current is followed with the relation of discharge overcurrent time of delay:
T wherein
EDIBe discharge overcurrent time of delay, I
EDIBe the overdischarge electric current, Q is a design constant.
Fig. 6 is the curve chart that the discharge delay time in the circuit shown in Figure 5 changes with the overdischarge electric current.
As shown in Figure 6, discharge overcurrent T time of delay
EDIBe inversely proportional to the overdischarge electric current I
EDIThereby, realized continuous variation discharge overcurrent time of delay with the overdischarge electric current.
Fig. 7 shows the overcurrent protection circuit for discharging electricity that discharge delay time according to the present invention is inversely proportional to discharge current value.
As shown in Figure 7, this circuit diagram comprises operational amplifier, EDI (discharge overcurrent) comparator, MP1 (p type field effect transistor), MP2, MP3, inverter U1, resistance R 1, MN1 (n type field effect transistor), MN2, capacitor C 1, oscillator comparator and timer.
The normal phase input end of EDI comparator is VM, and inverting input is the discharge overcurrent voltage threshold V of default
EDI, its output is connected respectively to the input of inverter U1 and the grid of MP3;
The inverting input of operational amplifier is connected to VM end, and its normal phase input end links to each other with the drain electrode of MP1 and is connected to an end of resistance R 1, and its output is connected to the drain electrode of MP3 and the grid of MP1, MP2;
The source electrode of MP1, MP2, MP3 all is connected to the VCC end, and the drain electrode of MP1 is connected to resistance R 1, and the drain electrode of MP2 is connected respectively to the drain electrode of MN1, MN2, an end of capacitor C 1 and the normal phase input end of oscillator comparator;
The anti-phase reference voltage V that is input as default of oscillator comparator
REF
The other end ground connection of resistance R 1;
The source ground of MN1, its grid are connected respectively to the output of oscillator comparator and the input of timer;
The grid of MN2 is connected to the output of inverter, and its source electrode is connected to the other end and the ground connection of capacitor C 1.
When VM greater than V
EDIThe time, MP3 ends, and MN2 also ends, and operational amplifier and oscillator are all started working.The voltage that operational amplifier can be adjusted its normal phase input end equals the voltage of its inverting input, thereby makes the electric current of the R1 that flows through equal VM/R1.This electric current flows out from the drain electrode of MP2 through the current mirroring circuit mirror image of MP1 and MP2 formation, to capacitor C 1 charging.Voltage on C1 rises to V
REFThe time, oscillator comparator output high level, the MN1 conducting is discharged to earth potential with the voltage on the C1, oscillator comparator output low level, MN1 ends, and the voltage on the C1 continues to be risen by the drain charge of MP2, goes round and begins again, and forms vibration.Full N all after date of timer meter, guard signal EDI uprises, and carries out overcurrent protection control.Here, timer not necessarily, but its employing can be so that the electric capacity of C1 reduces, thereby saves chip area.
The oscillator comparator need be designed to certain time of delay, is generally less than 100nS, greater than 10nS.Specifically, be exactly that the grid of MN1 is a high voltage, is generally supply voltage when oscillator output high level.Especially, the discharging current after the MN1 conducting is far longer than the electric current (being the charging current of capacitor C 1) of MP2.In general, can ignore with respect to its charging interval less than 5% of cycle of oscillation the discharge time of capacitor C 1.What also need to satisfy is that in this discharge time, the voltage on the C1 can be discharged into zero.It is a sawtooth waveforms that capacitor C 1 discharges and recharges formed oscillator signal.The breadth length ratio of MN2 generally can satisfy design requirement greater than 5: 1 in the discharge circuit.
When VM less than V
EDIThe time, the MP3 conducting, MN2 is conducting also, and operational amplifier and oscillator all quit work.
The electric current of described MP1 and MP2 becomes mirror, can equate, also can be the M multiple.In the circuit design of reality, can design MP1 and MP2 according to the specific requirement of discharge overcurrent time of delay and cost, the multiple relation of the electric current between MP1 and the MP2 of determining thus to flow through.In one embodiment of the invention, the current ratio of flow through MP1 and MP2 is 1, promptly equates.During work, the electric current of flow through MP1 and MP2 equals VM/R1, and VM is the voltage of VM node.The voltage of VM equals I
EDI. (R
ON_MD+ R
ON_MC).Its value of MP2 output and the electric current that voltage VM is directly proportional allow oscillator start working.The period T of oscillator
OSCFor:
Postpone T through N cycle timing
DEqual N.T
D
Wherein,
As can be seen from the above time of delay TD and overdischarge electric current I
EDIInversely proportional.
Divide according to the principle of work and power, the operational amplifier among Fig. 7, MP1, MP2, resistance R 1 can be considered a voltage-controlled current source, and MP3 can be considered one and enables control circuit.In addition, the capacitor C 1 among Fig. 7, oscillator comparator, MN1 can be considered an oscillating unit, and inverter U1, MN2 also can be considered one and enable control circuit.Circuit conclusion described here should not be considered as restricted, and should be considered as illustrative.In other words, described voltage-controlled current source, oscillating unit and two each other enable control circuit and can have different elements but the devices/circuits that can realize identical function replaces by other.
Fig. 8 is the structured circuit figure of circuit shown in Figure 7.
According to the described circuit conclusion/structuring of Fig. 7, circuit shown in Figure 8 preferably includes discharge overcurrent (EDI) comparator, voltage-controlled current source, enables control circuit 1, oscillating unit, enables control circuit 2, timer.
The input that enables control circuit 1 is connected to the output of discharge overcurrent comparator, and its output is connected to the control end that enables of voltage-controlled current source, is used for starting voltage-controlled current source according to the judged result of discharge overcurrent comparator; The input of voltage-controlled current source receives discharge overcurrent voltage, and its output is the output of voltage controlled current source circuit, is used to produce its value and the proportional electric current of discharge overcurrent magnitude of voltage.In the described embodiment of Fig. 7, the electric current that the voltage controlled current source circuit is produced is inversely proportional to discharge overcurrent voltage.Chase after its root by, promptly the electric current that produces of voltage-controlled current source is directly proportional with discharge overcurrent voltage, the electric current of the cycle of oscillation of oscillator and voltage-controlled current source generation is inversely proportional to.
The input that enables control circuit 2 is connected to the output of discharge overcurrent comparator, and its output is connected to the control end that enables of oscillating unit, is used for starting oscillating unit according to the judged result of discharge overcurrent comparator.Should be pointed out that the control circuit that enables described herein can be any circuit of enabling to control can realized, and can constitute by different elements to reach this purpose.The input of oscillating unit receives the electric current that the voltage controlled current source circuit produces, and its output is the output of oscillator, is used to produce a cycle of oscillation and the proportional oscillator signal of described electric current, and according to the oscillator signal overcurrent protection of discharging.
As shown in Figure 8, the EDI comparator is used to judge whether to occur over-current state, and two input is respectively VM and V
EDI, V
EDIReference voltage for default.The voltage of holding as VM is higher than V
EDIThe time, the circuit that this time of delay and overdischarge electric current are inversely proportional to is started working, and promptly sends enable signal to enabling control circuit 1,2 respectively, starts described voltage-controlled current source and oscillating unit by enabling control circuit again.Otherwise, the circuit that this time of delay and overdischarge electric current the are inversely proportional to work that is under an embargo.During work, voltage-controlled current source produces a current source.Preferably, according to concrete circuit design, the current value of described current source is proportional to the voltage of VM.Current source exports oscillating unit to, and the cycle of oscillation of oscillating unit and above-mentioned current value are inversely proportional.Timer is according to the oscillator signal timing of oscillating unit, the discharge overcurrent be time of delay the described oscillator signal cycle N doubly.From the description of Fig. 7 as can be known N also be a design constant relevant in theory with Q.
Fig. 9 is the structured circuit figure of circuit shown in Figure 8.
Be similar to the transformation to Fig. 8, on the principle of work and power, Fig. 8 further can be concluded/be structured as circuit diagram shown in Figure 9 from Fig. 7.Preferably, shown in Figure 8 enable control circuit 1 and voltage-controlled current source can constitute a voltage controlled current source circuit, enable control circuit 2 and oscillating unit and can constitute an oscillator.
As shown in Figure 9, described voltage controlled current source circuit comprises the input that receives described discharge overcurrent voltage, the output that enables control end and export to described oscillator that receives described discharge overcurrent comparator output, is used to produce its current value and the described proportional electric current of discharge overcurrent magnitude of voltage and exports to described oscillator; Described oscillator comprises the input that receives the electric current that described voltage controlled current source circuit produces, receive described discharge overcurrent comparator output enable control end and output; be used to produce a cycle of oscillation and the proportional oscillator signal of described electric current; and export timer to; timer carries out timing according to described oscillator signal, thereby discharges overcurrent protection.
Figure 10 is the structured circuit figure of circuit shown in Figure 9.
Again, on the principle of work and power, Fig. 9 further can be concluded/is structured as circuit diagram shown in Figure 10.Preferably, voltage controlled current source circuit and oscillator shown in Figure 9 can constitute a Voltage-Controlled oscillation circuit.
As shown in figure 10, this circuit comprises discharge overcurrent comparator and Voltage-Controlled oscillation circuit, wherein: two of described discharge overcurrent comparator are input as discharge overcurrent voltage and discharge overcurrent voltage threshold (VEDI), its output is connected to the control end that enables of described Voltage-Controlled oscillation circuit, be used to judge whether to occur over-current state, and when over-current state occurring, start Voltage-Controlled oscillation circuit; Described Voltage-Controlled oscillation circuit comprises the input that receives described discharge overcurrent voltage, the output that enables control end and outputting oscillation signal that receives described discharge overcurrent comparator output; be used to produce a cycle of oscillation and the proportional oscillator signal of described discharge overcurrent voltage; and export timer to; timer carries out timing according to described oscillator signal, thereby discharges overcurrent protection.
Obviously, under the prerequisite that does not depart from true spirit of the present invention and scope, the present invention described here can have many variations.Therefore, the change that all it will be apparent to those skilled in the art that all should comprise within the scope that appending claims contains.The present invention's scope required for protection is only limited by appending claims.
Claims (16)
1. an overcurrent protection circuit for discharging electricity is characterized in that comprising discharge overcurrent comparator and Voltage-Controlled oscillation circuit, wherein:
Two of described discharge overcurrent comparator are input as discharge overcurrent voltage and discharge overcurrent voltage threshold (V
EDI), its output is connected to the control end that enables of described Voltage-Controlled oscillation circuit, is used to judge whether to occur over-current state, and starts Voltage-Controlled oscillation circuit when over-current state occurring;
Described Voltage-Controlled oscillation circuit comprises the input that receives described discharge overcurrent voltage, the output that enables control end and outputting oscillation signal that receives described discharge overcurrent comparator output; be used to produce a cycle of oscillation and the proportional oscillator signal of described discharge overcurrent voltage, and according to the overcurrent protection of discharging of described oscillator signal.
2. according to the overcurrent protection circuit for discharging electricity of claim 1, also comprise timer, be used to receive the oscillator signal of described oscillator, and carry out timing according to described oscillator signal.
3. according to the overcurrent protection circuit for discharging electricity of claim 1, wherein, described Voltage-Controlled oscillation circuit comprises voltage controlled current source circuit and oscillator:
Described voltage controlled current source circuit comprises the input that receives described discharge overcurrent voltage, the output that enables control end and export to described oscillator that receives described discharge overcurrent comparator output, is used to produce its current value and the described proportional electric current of discharge overcurrent magnitude of voltage and exports to described oscillator;
Described oscillator comprises the input that receives the electric current that described voltage controlled current source circuit produces, receive described discharge overcurrent comparator output enable control end and output; be used to produce a cycle of oscillation and the proportional oscillator signal of described electric current, and according to the overcurrent protection of discharging of described oscillator signal.
4. according to the overcurrent protection circuit for discharging electricity of claim 3, wherein, described voltage controlled current source circuit comprises that first enables control circuit and voltage-controlled current source,
Described first input that enables control circuit is connected to the output of described discharge overcurrent comparator, and its output is connected to the control end that enables of described voltage-controlled current source, is used for starting described voltage-controlled current source according to the judged result of described discharge overcurrent comparator;
The input of described voltage-controlled current source receives described discharge overcurrent voltage, and its output is the output of described voltage controlled current source circuit, is used to produce its value and the proportional electric current of described discharge overcurrent magnitude of voltage.
5. according to the overcurrent protection circuit for discharging electricity of claim 4, wherein, described first enables control circuit comprises the 3rd p type field effect transistor and terminals (VCC):
The source electrode of described the 3rd p type field effect transistor is connected to described terminals (VCC), and its grid is connected to the output of described discharge overcurrent comparator, and its drain electrode is described first output that enables control circuit.
6. according to the overcurrent protection circuit for discharging electricity of claim 4, wherein, described voltage-controlled current source comprises operational amplifier, first p type field effect transistor, second p type field effect transistor, a resistance;
The flow through electric current mirror each other of first p type field effect transistor, second p type field effect transistor;
The inverting input of described operational amplifier is the input of described voltage-controlled current source, its normal phase input end links to each other with the drain electrode and the described resistance of first p type field effect transistor, and its output links to each other with the grid of first, second p type field effect transistor and is connected to first output that enables control circuit;
The source electrode of described first, second p type field effect transistor is connected to described terminals (VCC), and the drain electrode of second p type field effect transistor is the output of described voltage-controlled current source;
The other end ground connection of described resistance.
7. according to the overcurrent protection circuit for discharging electricity of claim 3, wherein, described oscillator comprises that second enables control circuit and oscillating unit,
Described second input that enables control circuit is connected to the output of described discharge overcurrent comparator, and its output is connected to the control end that enables of described oscillating unit, is used for starting described oscillating unit according to the judged result of described discharge overcurrent comparator;
The input of described oscillating unit receives the electric current that described voltage controlled current source circuit produces; its output is the output of described oscillator; be used to produce a cycle of oscillation and the proportional oscillator signal of described electric current, and according to the overcurrent protection of discharging of described oscillator signal.
8. according to the overcurrent protection circuit for discharging electricity of claim 7, wherein, described second enables control circuit comprises the inverter and second n type field effect transistor:
The input of described inverter is connected to the output of described discharge overcurrent comparator, and its output is connected to the grid of described second n type field effect transistor;
The source ground of described second n type field effect transistor, its drain electrode is described second output that enables control circuit.
9. according to the overcurrent protection circuit for discharging electricity of claim 7, wherein, described oscillating unit comprises electric capacity, oscillator comparator, first n type field effect transistor:
Anti-phase reference voltage (the V that is input as of described oscillator comparator
REF), its output links to each other with the grid of described first n type field effect transistor and as the output of described oscillating unit;
The normal phase input end of one end of described electric capacity, the drain electrode of described first n type field effect transistor and described oscillator comparator links to each other, as the input of described oscillating unit;
The other end of described electric capacity and the described second n type field effect transistor source ground.
10. according to the overcurrent protection circuit for discharging electricity of one of claim 1-9, wherein:
The electric current that described voltage-controlled current source produces is directly proportional with described discharge overcurrent voltage, and the electric current that described cycle of oscillation and described voltage-controlled current source produce is inversely proportional to.
11. an overcurrent protection circuit for discharging electricity is characterized in that comprising:
The output switch is used for opening or cutting out discharge path;
Control circuit is used for exporting control signal and cuts out discharge path with control output switch after receiving discharge over-current detection signal; With
The discharge over-current detection circuit is used to detect the electric current on the discharge path and provides discharge over-current detection signal to control circuit, and it comprises:
Comparator circuit, output enable signal when being used for electric current on discharge path and surpassing predetermined threshold;
Current generating circuit is used for after receiving described enable signal generating the electric current that is directly proportional with electric current on the discharge path;
Pierce circuit is used for the oscillator signal that the generation electric current in generation cycle and current generating circuit is inversely proportional to after receiving described enable signal; With
Counter is used for generating discharge over-current detection signal after counting a predetermined number oscillator signal.
12. the overcurrent protection circuit for discharging electricity according to claim 11 is characterized in that, described current generating circuit includes operational amplifier, the first transistor, transistor seconds, a resistance;
The grid of described the first transistor links to each other with the grid of described transistor seconds, described first and second transistorized source electrode links to each other with power supply, the grid of described the first transistor links to each other with the drain electrode of the first transistor, the drain electrode of described the first transistor also links to each other with an end of described resistance, the other end ground connection of described resistance
An input of described operational amplifier receives the voltage signal of the electric current on the reflection discharge path, and another input of described operational amplifier links to each other with the drain electrode of the first transistor moral, and the output of described operational amplifier links to each other with the grid of the first transistor,
The drain electrode of described transistor seconds is as the current output terminal of described current generating circuit.
13. overcurrent protection circuit for discharging electricity according to claim 12; it is characterized in that; described current generating circuit also comprises enable circuits, and described enable circuits is used to receive the enable signal of described comparator circuit, and enables described the first transistor after receiving this enable signal.
14. the overcurrent protection circuit for discharging electricity according to claim 11 or 12 is characterized in that, described pierce circuit comprises electric capacity, vibration comparator, discharge circuit;
One end of described electric capacity connects the output of current generating circuit, the other end ground connection of electric capacity;
An input of oscillator comparator links to each other with the output of current generating circuit, and another lattice input links to each other with preset reference voltage, and its output connects the control end of discharge circuit; Wherein,
The generation electric current of described current generating circuit is described electric capacity charging;
When the pressure drop on the electric capacity was higher than described preset reference voltage, the output switching activity of described vibration comparator discharged to electric capacity to control described discharge circuit;
When the pressure drop on the electric capacity was lower than described preset reference voltage, the output switching activity of described vibration comparator stopped electric capacity being discharged to control described discharge circuit, and the output signal of described vibration comparator is delayed the scheduled time.
15. overcurrent protection circuit for discharging electricity according to claim 14; it is characterized in that; described pierce circuit also comprises enable circuits, and described enable circuits is used to receive the enable signal of described comparator circuit, and allows described electric capacity is charged after receiving this enable signal.
16. a lithium battery protection circuit comprises the overcurrent protection circuit for discharging electricity according to claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101134065A CN101282036B (en) | 2008-05-29 | 2008-05-29 | Overcurrent protection circuit for discharging electricity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101134065A CN101282036B (en) | 2008-05-29 | 2008-05-29 | Overcurrent protection circuit for discharging electricity |
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| CN101282036A true CN101282036A (en) | 2008-10-08 |
| CN101282036B CN101282036B (en) | 2011-10-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN102043088A (en) * | 2010-11-15 | 2011-05-04 | 无锡中星微电子有限公司 | Overcurrent detection circuit |
| CN103633628A (en) * | 2013-11-22 | 2014-03-12 | 无锡中星微电子有限公司 | Battery protective circuit |
| CN104426141A (en) * | 2013-09-10 | 2015-03-18 | 上海空间电源研究所 | Accumulator discharging overcurrent protection circuit and method |
| CN105203962A (en) * | 2015-08-31 | 2015-12-30 | 北汽福田汽车股份有限公司 | Vehicle-mounted battery over-current diagnostic method and device |
| CN105762768A (en) * | 2014-11-20 | 2016-07-13 | 力智电子股份有限公司 | Battery protection device and operation method thereof |
| CN107093889A (en) * | 2017-06-08 | 2017-08-25 | 电子科技大学 | Electric machine controller with overcurrent protection function |
| CN107579508A (en) * | 2017-09-23 | 2018-01-12 | 华为技术有限公司 | A kind of apparatus for protecting power supply and the terminal using described device |
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| CN102043088A (en) * | 2010-11-15 | 2011-05-04 | 无锡中星微电子有限公司 | Overcurrent detection circuit |
| CN102043088B (en) * | 2010-11-15 | 2012-08-29 | 无锡中星微电子有限公司 | Overcurrent detection circuit |
| CN104426141A (en) * | 2013-09-10 | 2015-03-18 | 上海空间电源研究所 | Accumulator discharging overcurrent protection circuit and method |
| CN103633628A (en) * | 2013-11-22 | 2014-03-12 | 无锡中星微电子有限公司 | Battery protective circuit |
| CN103633628B (en) * | 2013-11-22 | 2016-06-15 | 无锡中感微电子股份有限公司 | A kind of battery protecting circuit |
| CN105762768A (en) * | 2014-11-20 | 2016-07-13 | 力智电子股份有限公司 | Battery protection device and operation method thereof |
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| CN105203962A (en) * | 2015-08-31 | 2015-12-30 | 北汽福田汽车股份有限公司 | Vehicle-mounted battery over-current diagnostic method and device |
| CN107093889B (en) * | 2017-06-08 | 2019-01-01 | 电子科技大学 | Electric machine controller with overcurrent protection function |
| CN107093889A (en) * | 2017-06-08 | 2017-08-25 | 电子科技大学 | Electric machine controller with overcurrent protection function |
| CN107579508A (en) * | 2017-09-23 | 2018-01-12 | 华为技术有限公司 | A kind of apparatus for protecting power supply and the terminal using described device |
| CN109089089A (en) * | 2018-09-19 | 2018-12-25 | 青岛海信电器股份有限公司 | Over-current protection method, the satellite television receiver of antenna control chip |
| CN110933383A (en) * | 2018-09-19 | 2020-03-27 | 青岛海信电器股份有限公司 | Overcurrent protection method and device for antenna control chip and satellite television receiver |
| CN109089089B (en) * | 2018-09-19 | 2021-04-16 | 海信视像科技股份有限公司 | Overcurrent protection method of antenna control chip and satellite television receiver |
| CN110933383B (en) * | 2018-09-19 | 2022-04-29 | 海信视像科技股份有限公司 | Overcurrent protection method and device for antenna control chip and satellite television receiver |
| CN112968427A (en) * | 2021-02-02 | 2021-06-15 | 苏州赛芯电子科技股份有限公司 | Time delay compensation circuit and lithium battery protection system thereof |
| CN112928736A (en) * | 2021-02-02 | 2021-06-08 | 苏州赛芯电子科技股份有限公司 | Delay adjustable circuit and lithium battery protection circuit thereof |
| CN112928736B (en) * | 2021-02-02 | 2022-06-28 | 苏州赛芯电子科技股份有限公司 | Delay adjustable circuit and lithium battery protection circuit thereof |
| CN112968427B (en) * | 2021-02-02 | 2022-07-01 | 苏州赛芯电子科技股份有限公司 | Time delay compensation circuit and lithium battery protection system thereof |
| CN114050554A (en) * | 2022-01-11 | 2022-02-15 | 深圳市创芯微微电子有限公司 | Battery protection circuit and power tube control method thereof |
| CN115882429A (en) * | 2023-01-30 | 2023-03-31 | 苏州赛芯电子科技股份有限公司 | Overcurrent protection circuit and battery system |
| CN115882429B (en) * | 2023-01-30 | 2024-02-02 | 苏州赛芯电子科技股份有限公司 | Overcurrent protection circuit and battery system |
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| CN101282036B (en) | 2011-10-12 |
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