CN203151081U - Battery protection circuit, battery management chip and magnetic resonance system - Google Patents
Battery protection circuit, battery management chip and magnetic resonance system Download PDFInfo
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- CN203151081U CN203151081U CN 201320061331 CN201320061331U CN203151081U CN 203151081 U CN203151081 U CN 203151081U CN 201320061331 CN201320061331 CN 201320061331 CN 201320061331 U CN201320061331 U CN 201320061331U CN 203151081 U CN203151081 U CN 203151081U
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Abstract
The utility model relates to a battery protection circuit, a battery management chip and a magnetic resonance system. The battery protection circuit includes a voltage division unit, a reference voltage generating unit, and a control unit, wherein the control unit comprises a comparator, a fourth resistor, a fifth resistor, a sixth resistor and a transistor; an in-phase input end of the comparator inputs the voltage of a battery outputted by the voltage division unit, and an anti-phase end of the comparator inputs reference voltage provided by the voltage reference generating unit; a first end of the fourth resistor is coupled with a cathode of the battery, and a second end of fourth resistor is coupled with an output end of the comparator; a first end of the fifth resistor is coupled with the second end of fourth resistor, and a second end of the fifth resistor is coupled with a gate pole of the transistor; a first end of the sixth resistor is coupled with the second end of the fifth resistor, and a second end of the sixth resistor is coupled with ground; and a drain pole of the transistor is coupled with the second end of the sixth resistor, and a source pole of the transistor is coupled with a load. The battery protection circuit, the battery management chip and the magnetic resonance system of the utility model are advantageous in improved probability of normal working of the load, simple circuit structure, low cost and low power consumption.
Description
Technical field
The utility model relates to the mr techniques field, particularly a kind of battery protecting circuit, battery management chip and magnetic resonance system.
Background technology
Magnetic resonance imaging (MRI, Magnetic Resonance Imaging) system is widely used in the medical electronics industry as medical imaging device.The MRI system comprises: magnet system, imaging system, sick bed system, power-supply system, cooling system, control system.Magnet in the magnet system is as the core component in the MRI system, for imaging provides needed magnetic field environment.At present, according to the difference of magnet type, the MRI system can be divided into permanent-magnet type MRI system, often lead type MRI system, superconduct MRI system.
For superconduct MRI system, when superconducting magnet is stored in suitable critical temperature when following (being in superconducting state), by electric current flowing in superconducting coil, produce good evenness, stability is high, magnetic field intensity is high magnetic field thereby can circulate.In actual conditions, the part of superconducting coil may become normality (being the non-superconducting attitude) again, has a resistance, and makes that electric current reduces rapidly in the superconducting coil, and the magnetic energy of storage is converted into Joule heat, and then causes the temperature of relevant range to raise, and this phenomenon is called quench.The heat that quench produces can cause the temperature of superconducting coil further to raise, and can make whole magnet break away from superconducting state and become normality again even damage magnet.Therefore, can be provided with the quench protection device in superconduct MRI system, to prevent from burning out superconducting coil.
Yet special or in emergency circumstances at some, the magnetic field that superconducting coil is produced rapidly disappears, i.e. quench initiatively.For example: patient is when doing magnetic resonance, mistake with have magnetic article on one's body, perhaps has magnetic medicine equipment in its body, as: cardiac pacemaker, electronics organ etc., the operation of meeting disturbing magnetic field on the one hand, influence check result, blood vessel and tissue near the movement of medicine equipment in magnetic field that has magnetic on the other hand also can damage produce serious consequence.At this moment, magnetic field is rapidly disappeared.And for example, when the magnetic resonance examination chamber catches fire, if the fire fighter of fire extinguishing carries the article with magnetic, also can damage it, so also need magnetic field is rapidly disappeared.In superconduct MRI system, make described superconducting coil initiatively become normality (being the non-superconducting attitude) again by the quench heater with tight contact of superconducting coil, and then make magnetic field initiatively disappear.The control magnet initiatively parts of quench is " magnet control unit ", simultaneously, also is provided with the quench switch and the quench control circuit that the quench heater are carried out corresponding control in the superconduct MRI system.Press the quench switch, after the magnet control unit received the signal that the quench switch sends, control quench control circuit, and then drive the work of quench heater was so that superconducting coil quench initiatively.
Generally provide big electric current to make its heating by main power source to the quench heater, and then make initiatively quench of superconducting coil.In order to prevent can't working owing to primary power source de-energizes causes the quench heater, with battery as stand-by power supply power (generally adopting lead-acid battery).For battery; for a long time big electric current power supply meeting causes irreversible infringement to battery; serious meeting causes the battery heating; leakage; situation such as catch fire takes place; therefore; battery protecting circuit can be set in the prior art usually prevent battery over-discharge; yet; existing battery protecting circuit was in case lost efficacy; can cause main power source and battery all can't drive the quench heater; reduce the probability of quench heater operate as normal, and adopt existing battery protecting circuit, after battery enters guard mode; need to adopt the mode of manual or software that the guard mode of battery is removed, caused great inconvenience.
The utility model content
Problem to be solved in the utility model provides a kind of simple in structure, battery protecting circuit that cost is low, to improve the probability of quench heater operate as normal.
For addressing the above problem, technical solutions of the utility model provide a kind of battery protecting circuit, comprising: partial pressure unit, reference voltage generation unit, control unit; Described partial pressure unit is exported the voltage of described battery to described control unit; Described reference voltage generation unit provides reference voltage to described control unit; Described control unit is voltage and the described reference voltage of battery relatively, controls the supply access of described battery and load;
Described control unit comprises: comparator, the 4th resistance, the 5th resistance, the 6th resistance and transistor; Wherein,
The in-phase input end of described comparator is imported the voltage of described battery, and inverting input is imported described reference voltage;
First end of described the 4th resistance and the positive pole of described battery couple, and the output of second end and described comparator couples;
First end of described the 5th resistance and second end of described the 4th resistance couple, and second end and described transistorized grid couple;
First end of described the 6th resistance and second end of described the 5th resistance couple, second end with couple;
Second end of described transistor drain and described the 6th resistance couples, source electrode and described load coupled.
Optionally, described battery protecting circuit also comprises: separate lock unit, described solution lock unit is controlled described reference voltage generation unit and is produced reference voltage so that the supply access between described control unit closure/described battery of disconnection and the load.
Optionally, described reference voltage generation unit comprises: the 3rd resistance and voltage-stabiliser tube; Wherein,
First end of described the 3rd resistance and first end of described the 4th resistance couple, and the second end output reference voltage is to the inverting input of described comparator;
First end of described voltage-stabiliser tube and second end of described the 3rd resistance couple, second end with couple.
Optionally, described solution lock unit comprises: the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, first triode, second triode and amplifier; Wherein,
First end of described the 7th resistance and first end of described the 4th resistance couple, and first end of second end and described the 8th resistance couples;
Second end of described the 8th resistance and described transistorized source electrode couple;
Second end of the in-phase input end of described amplifier and described the 7th resistance couples, and second end of inverting input and described the 8th resistance couples, and first end of output and described the 9th resistance couples;
Second end of described the 9th resistance, first end of the tenth resistance couple with the base stage of described first triode respectively;
Second end of described the tenth resistance with couple;
The collector electrode of the collector electrode of described first triode, second triode couples with second end of described voltage-stabiliser tube respectively, and the emitter of the emitter of described first triode, second triode couples with ground respectively;
First end of described the 11 resistance and the base stage of described second triode couple, second end with couple;
First end of described the 12 resistance and the base stage of described second triode couple, and first end of second end and described the 5th resistance couples.
Optionally, described first triode, second triode are NPN type triode.
Optionally, described solution lock unit also comprises: first electric capacity and second electric capacity; Wherein,
First end of described first electric capacity and the base stage of described first triode couple, second end with couple;
First end of described second electric capacity and the base stage of described second triode couple, second end with couple.
Optionally, described partial pressure unit comprises; First resistance and second resistance; Wherein,
First end of described first resistance and the positive pole of described battery couple, and the voltage of second end output battery is to the in-phase input end of described comparator;
First end of described second resistance and second end of described first resistance couple, second end with couple.
Optionally, described transistor is nmos pass transistor.
For addressing the above problem, technical solutions of the utility model also provide a kind of battery management chip, comprise charging circuit, also comprise above-mentioned battery protecting circuit.
For addressing the above problem, technical solutions of the utility model also provide a kind of magnetic resonance system, comprising: above-mentioned battery protecting circuit; The magnet control unit is used for described battery protecting circuit is monitored.
Compared with prior art, the technical solution of the utility model has the following advantages:
Adopt partial pressure unit, reference voltage generation unit and control unit to constitute battery protecting circuit; the life-span that one side has improved battery; on the other hand; based on the relation that couples between each device and load and the battery in the described control unit; even battery protecting circuit lost efficacy, main power source still can power to the load, when load is the quench heater; improved the probability of quench heater operate as normal, and then also avoided because the hidden danger that quench heater cisco unity malfunction causes.
In specific embodiment; described battery protecting circuit also comprises the solution lock unit; produce reference voltage by the described reference voltage generation unit of described release unit controls; carry out release with the guard mode to battery; because separating lock unit is realized by hardware fully; so can remove the guard mode of battery by the mode of hardware trigger, need not by the mode of manual or software the guard mode of battery to be removed, bring great convenience.
Battery protecting circuit comprises partial pressure unit, reference voltage generation unit and control unit, and circuit structure is simple, and cost is low and power consumption is little.
Magnetic resonance system comprises magnet control unit and battery protecting circuit; by the measurement of described magnet control unit to the load both end voltage, and then detect described battery protecting circuit and whether break down, if break down; then report to the police, guaranteed the reliability in the battery protecting circuit running.
Description of drawings
Fig. 1 is the schematic diagram of the battery protecting circuit of magnetic resonance system;
Fig. 2 is the schematic diagram of the battery protecting circuit of the utility model embodiment one;
Fig. 3 is the schematic diagram of the battery protecting circuit of the utility model embodiment two.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can more be become apparent, below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.Set forth detail in the following description so that fully understand the utility model.But the utility model can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization under the situation of the utility model intension.Therefore the utility model is not subjected to the restriction of following public embodiment.
As described in the background art, battery protecting circuit has reduced the probability of quench heater operate as normal in the existing magnetic resonance system.See also Fig. 1, Fig. 1 is the schematic diagram of the battery protecting circuit of magnetic resonance system, and described battery protecting circuit 1 comprises: partial pressure unit 10, reference voltage generation unit 11, comparator U
10With switch element 12.Among Fig. 1, the quench switch SW
1Be used for control with quench control circuit 3 and drive quench heater 4, charging circuit 6 is used for battery 5 is charged.
Described partial pressure unit 10 comprises: resistance R
101And R1
02, be used for the cell voltage dividing potential drop, obtain sampling voltage, and export described sampling voltage to comparator U
10In-phase input end.Described reference voltage generation unit 11 comprises: resistance R
111With voltage-stabiliser tube D
10, work as resistance R
111With voltage-stabiliser tube D
10(described burning voltage refers to voltage-stabiliser tube D under rated current to the voltage at the place of coupling during greater than burning voltage
10Reverse breakdown voltage, can be by adjusting resistance R
111Resistance realize), resistance R
111With voltage-stabiliser tube D
10Couple the place and produce reference voltage, export described reference voltage to comparator U
10Reverse input end, work as resistance R
111With voltage-stabiliser tube D
10The voltage that couples the place is during less than burning voltage, and reference voltage generation unit 11 is inoperative.Described comparator U
10Described sampling voltage and reference voltage are compared, export first signal during greater than reference voltage to described switch element 12 in described sampling voltage, described sampling voltage during less than reference voltage the output secondary signal to described switch element 12.Described switch element 12, the supply access after receiving first signal between closed described battery 5 and the quench heater 4 disconnects the supply access between described battery 5 and the quench heater 4 after receiving secondary signal.
The inventor is through determining; battery protecting circuit shown in Fig. 1, because the position at its switch element 12 places, in case described battery protecting circuit 1 lost efficacy; can cause main power source 7 and battery 5 all can't drive quench heater 4, and then cause the quench heater 4 can't operate as normal.For the situation of active quench, quench heater 4 can not in time be driven, and can cause serious consequence.And the battery protecting circuit shown in Fig. 11; supply access between battery 5 and quench heater 4 is disconnected; after battery enters guard mode (lock-out state); if will remove the guard mode of battery 5; so that form the loop between itself and the quench heater 4; then need to remove by the mode of manual or software the guard mode of battery 5, caused very big inconvenience.
The inventor proposes; on the basis of partial pressure unit and reference voltage generation unit; add control unit; by coupling between described control unit and battery, the quench heater; and with described partial pressure unit and reference voltage generation unit between cooperate, improve the probability of quench heater operate as normal again at the protection battery, when improving battery life.
Below with the load for the quench heater is example, the technical solution of the utility model is described.Need to prove that the load in the utility model is not limited only to the quench heater, it will be appreciated by those skilled in the art that described load can be that any one treats power supply unit.Therefore, load is that the quench heater should be as the restriction to technical solutions of the utility model.
Embodiment one
See also Fig. 2, Fig. 2 is the schematic diagram of the battery protecting circuit of the utility model embodiment one, and as shown in Figure 2, described battery protecting circuit 2 comprises: partial pressure unit 20, reference voltage generation unit 21, control unit 22;
The voltage of the described battery of described partial pressure unit 20 outputs is to described control unit 22.
Described reference voltage generation unit 21 provides reference voltage to described control unit 22.
Described control unit 22 is voltage and the described reference voltage of battery relatively, controls the supply access between described battery 5 and the quench heater 4.
In the present embodiment, described control unit 22 comprises: comparator U
1, the 4th resistance R
4, the 5th resistance R
5, the 6th resistance R
6With transistor Q
1Wherein,
Described comparator U
1In-phase input end import the voltage of described battery, inverting input is imported described reference voltage.
Described the 4th resistance R
4First end and the positive pole of described battery 5 couple second end and described comparator U
1Output couple.
Described the 5th resistance R
5First end and described the 4th resistance R
4Second end couple second end and described transistor Q
1Grid couple.
Described the 6th resistance R
6First end and described the 5th resistance R
5Second end couple, second end with couple.
Described transistor Q
1Drain electrode and described the 6th resistance R
6Second end couple, source electrode and described quench heater 4 couple.
In the present embodiment, described partial pressure unit 20 comprises first resistance R
1With second resistance R
2Wherein,
Described first resistance R
1First end and the positive pole of described battery 5 couple, the voltage (cell voltage is through described partial pressure unit 20 voltage after partial) of second end output battery is to described comparator U
1In-phase input end.Described second resistance R
2First end and described first resistance R
1Second end couple, second end with couple.Described reference voltage generation unit 21 comprises: the 3rd resistance R
3With voltage-stabiliser tube D
1Wherein,
Described the 3rd resistance R
3First end and described the 4th resistance R
4First end couple, the second end output reference voltage is to described comparator U
1Inverting input.
Described voltage-stabiliser tube D
1First end and described the 3rd resistance R
3Second end couple, second end with couple.
In the present embodiment, the comparator U in the described control unit 22
1Power end and the positive pole of described battery 5 couple, earth terminal with couple.Described the 4th resistance R
4Be pull-up resistor, the 5th resistance R
5Be current-limiting resistance, the 6th resistance R
6Be divider resistance, be used for transistor Q
1Grid the static water conservancy diversion to ground, described transistor Q
1Be nmos pass transistor.Those skilled in the art know, and when battery is the load power supply, and need to form closed circuit between the load.So in the present embodiment, first end of the positive pole of described battery 5 and quench heater 4 couples, described the 4th resistance R
4, the 3rd resistance R
3, first resistance R
1First end all couple with first end of described quench heater 4.Described the 6th resistance R
6Second end with ground couple, generally the negative pole of battery and couple, so described the 6th resistance R
6Second end also couple described nmos pass transistor Q with the negative pole of described battery 5
1Drain electrode also couple with the negative pole of described battery 5, source electrode then couples with second end of described quench heater 4.
In the present embodiment, the voltage-stabiliser tube D in the described reference voltage generation unit 21
1First end be negative electrode, second end is anode.In other embodiments, described reference voltage generation unit also can be realized by the reference voltage chip.
In the practical application, need by the quench control circuit quench heater is controlled accordingly and main power source and described quench heater between also to form the loop.Therefore, as shown in Figure 2, the positive pole of described battery 5, described the 4th resistance R
4, the 3rd resistance R
3, first resistance R
1First end all couple by first end of described quench control circuit 3 with described quench heater 4.The positive pole of described main power source 7 also first end by described quench control circuit 3 and described quench heater 4 couples that (charging circuit 6 shown in Fig. 2 is used for described battery 5 is charged, the operation principle of described charging circuit 6 is prior art, give unnecessary details no longer in detail herein), second end of the negative pole of described main power source 7 and described quench heater 4 couples.
In the present embodiment, described transistor Q
1Be nmos pass transistor, in other embodiments, described transistor Q
1For also being the PMOS transistor, at this moment, the comparator U in the described control unit 22
1In-phase input end import described reference voltage, inverting input is imported the voltage of described battery; The transistorized source electrode of described PMOS and described the 6th resistance R
6Second end couple, drain electrode couples with second end of described quench heater 4.
Illustrate accordingly below in conjunction with the operation principle of the battery protecting circuit battery protecting circuit to present embodiment.
After main power source 7 power down, press the quench switch SW
1, powered first resistance R in the partial pressure unit 20 by 5 pairs of quench heaters 4 of battery
1The voltage of second end output battery, and the voltage of described battery exports comparator U in the described control unit 22 to
1In-phase input end.Voltage-stabiliser tube D in reference voltage generation unit 21
1The voltage of first end is during greater than burning voltage, the 3rd resistance R
3The second end output reference voltage to described comparator U
1Inverting input, described reference voltage is described voltage-stabiliser tube D
1Reverse breakdown voltage.When the voltage of described battery during greater than described reference voltage, comparator U
1Output output high level, nmos pass transistor Q
1Conducting, the supply access closure between described battery 5 and the quench heater 4.Along with the consumption of battery electric quantity, the voltage of described battery is less than described reference voltage, comparator U
1The output output low level, nmos pass transistor Q
1End, the supply access between described battery 5 and the quench heater 4 disconnects, and prevents battery 5 overdischarge.
As seen from Figure 2; adopt the battery protecting circuit of present embodiment; even battery protecting circuit 2 lost efficacy; in case of emergency; still can power by 7 pairs of quench heaters 4 of main power source; improved the probability of quench heater 4 operate as normal, also avoided because can't in time driving the serious consequence that quench heater 4 causes.
Embodiment two
See also Fig. 3; Fig. 3 is the schematic diagram of the battery protecting circuit of the utility model embodiment two; for the battery protecting circuit 2 among Fig. 2, the battery protecting circuit 2 among Fig. 3 ' also comprise and separate lock unit 23 is to remove the guard mode of battery 5 by hardware mode.Similar among partial pressure unit 20, reference voltage generation unit 21, control unit 22 and the embodiment one among Fig. 3, repeat no more herein.
In the present embodiment, the described reference voltage generation unit 21 of described solution lock unit 23 controls produces reference voltage so that the supply access between the described battery 5 of described control unit 22 closure/disconnections and the load.Particularly, described solution lock unit 23 comprises:
The 7th resistance R
7, the 8th resistance R
8, the 9th resistance R
9, the tenth resistance R
10, the 11 resistance R
11, the 12 resistance R
12, the first triode TR
1, the second triode TR
2With amplifier A
1Wherein,
Described the 7th resistance R
7First end and described the 4th resistance R
4First end couple second end and described the 8th resistance R
8First end couple.
Described the 8th resistance R
8Second end and described transistor Q
1Source electrode couple.
Described amplifier A
1In-phase input end and described the 7th resistance R
7Second end couple inverting input and described the 8th resistance R
8Second end couple output and described the 9th resistance R
9First end couple.
Described the 9th resistance R
9Second end, the tenth resistance R
10First end respectively with the described first triode TR
1Base stage couple.
Described the tenth resistance R
10Second end with couple.
The described first triode TR
1Collector electrode, the second triode TR
2Collector electrode respectively with described voltage-stabiliser tube D
1Second end couple the described first triode TR
1Emitter, the second triode TR
2Emitter couple with ground respectively.
Described the 11 resistance R
11First end and the described second triode TR
2Base stage couple, second end with couple.
Described the 12 resistance R
12First end and the described second triode TR
2Base stage couple second end and described the 5th resistance R
5First end couple.
In the present embodiment, the described first triode TR
1With the second triode TR
2Constitute or door the described first triode TR
1With the second triode TR
2Be NPN type triode.As the described first triode TR
1With the second triode TR
2When input that constitute or door had any one to be high level, reference voltage generation unit 21 operate as normal were at voltage-stabiliser tube D
1The voltage of first end is during greater than burning voltage, the 3rd resistance R
3The second end output reference voltage to described comparator U
1Inverting input.If two inputs described or door are low level, then described reference voltage generation unit 21 is inoperative, described the 3rd resistance R
3The voltage of second end output battery to described comparator U
1Inverting input.Described amplifier A
1Power end and the positive pole of described battery couple, earth terminal with couple.In the present embodiment, described transistor Q
1Be nmos pass transistor, in other embodiments, described transistor Q
1Also can be PMOS transistor, transistor Q
1During for the PMOS transistor, comparator U in the control unit 22
1Input, and described the 6th resistance R of PMOS transistor AND gate
6With similar among the coupling mode of quench heater 4 and the embodiment one, no longer describe in detail herein.
Known by above-mentioned, in actual applications, described the 4th resistance R
4First end couple by first end of described quench control circuit 3 with described quench heater 4, so described the 7th resistance R
7First end also couple by first end of described quench control circuit 3 with described quench heater 4.Described transistor Q
1Source electrode and second end of described quench heater 4 couple, so described the 8th resistance R
8Second end and second end of described quench heater 4 couple.Similar among the coupling mode of described quench heater 4 and main power source 7 and the embodiment one, repeat no more herein.
In the present embodiment, in order to prevent existing interference signal to cause the first triode TR in the input signal
1With the second triode TR
2Unlatching, described solution lock unit 23 also comprises: first capacitor C
1With second capacitor C
2Described first capacitor C
1First end and the described first triode TR
1Base stage couple, second end with couple; Described second capacitor C
2First end and the described second triode TR
2Base stage couple, second end with couple.
Below in conjunction with the operation principle of battery protecting circuit, the battery protecting circuit of present embodiment is illustrated accordingly.
Among Fig. 3, SW
1Be the quench switch, itself and quench control circuit 3, magnet control unit 9 are controlled the driving of described quench heater 4 jointly.In actual applications, described quench switch SW
1Comprise current-limiting resistance, when pressing described quench switch SW
1The back (is described quench switch SW
1Closed), described magnet control unit 9 can be received first control signal of its transmission, and feed back accordingly, so that described current-limiting resistance, forms big electric current by short circuit to drive described quench heater 4 work in the supply access between described battery 5 and quench heater 4.If described quench switch SW
1Disconnect, described magnet control unit 9 can be received second control signal of its transmission, and feed back accordingly, so that described current-limiting resistance works, form little electric current in the supply access between described battery 5 and quench heater 4, described little electric current can't drive described quench heater 4 work.That is to say, when described quench switch SW
1When closed, 4 work of quench heater are when described quench switch SW
1During disconnection, quench heater 4 quits work.
Please continue to consult Fig. 3, generally, when main power source 7 normal power supplies, separate amplifier A in the lock unit 23
1In-phase input end import the 7th resistance R
7The voltage of second end, inverting input with couple amplifier A
1Output export first voltage, and described first voltage is greater than the described first triode TR
1Conducting voltage, the first triode TR
1Conducting is as voltage-stabiliser tube D
1The voltage of first end is during greater than burning voltage, the 3rd resistance R in the reference voltage generation unit 21
3Second end produce reference voltage U
Ref, first resistance R in the partial pressure unit 20
1The voltage U of second end output battery
b, and U
b＞U
Ref, comparator U in the control unit 22
1The output high level, the second triode TR
2Conducting, nmos pass transistor Q
1Conducting.Because be main power source 7 normal power supplies this moment, so battery 5 is in floating charge state.
Main power source 7 power down, amplifier A
1Output export second voltage, and described second voltage is less than the described first triode TR
1Conducting voltage, the first triode TR
1End.First resistance R in the partial pressure unit 20
1The voltage U of second end output battery
b, as voltage-stabiliser tube D
1The voltage of first end is during greater than burning voltage, the 3rd resistance R in the reference voltage generation unit 21
3Second end produce reference voltage U
Ref, and U
b＞U
Ref, comparator U
1The output high level, the second triode TR
2Conducting, nmos pass transistor Q
1Conducting.Press the quench switch SW this moment
1, battery 5 provides big electric current for described quench heater 4, and described quench heater 4 is driven, starts working, and cell voltage progressively descends.First resistance R in partial pressure unit 20
1The voltage U of second end output battery
b＜U
RefThe time, comparator U
1Output low level, nmos pass transistor Q
1End the second triode TR
2End.Because the first triode TR
1By, the second triode TR
2End, so, voltage-stabiliser tube D
1Anode unsettled, voltage-stabiliser tube D
1Do not produce effect.Comparator U
1The voltage U of inverting input input battery
b, the voltage of in-phase input end input is less than the voltage U of battery
b, comparator U
1Output be locked in low level, supply access between battery 5 and the quench heater 4 disconnects, and prevents battery 5 overdischarge, battery 5 enters guard mode.Because voltage-stabiliser tube D
1Anode unsettled, voltage-stabiliser tube D
1Do not produce effect, so comparator U
1Output be locked in low level always, so prevented that also battery 5 from entering after the guard mode quench heater 4 that the rise owing to cell voltage causes and starting repeatedly, protected quench heater 4.
When main power source 7 re-powers, amplifier A
1Output export first voltage, and described first voltage is greater than the described first triode TR
1Conducting voltage, the first triode TR
1Conducting; because after battery 5 enters guard mode; supply access between battery 5 and the quench heater 4 is disconnected; and for the battery 5 that adopts big electric current power supply; after supply access between battery 5 and the quench heater 4 disconnects; cell voltage can rise to some extent, the voltage U of the battery that partial pressure unit 20 produces
bReference voltage U greater than 21 generations of reference voltage generation unit
Ref, comparator U
1The output high level, the second triode TR
2Conducting, nmos pass transistor Q
1Conducting, battery 5 de-preservation states.
In the present embodiment, by separating the first triode TR of lock unit 23
1Conducting make voltage-stabiliser tube D in the reference voltage generation unit 21
1Plus earth, make the reference voltage generation unit 21 generation reference voltage that works, and then make comparator U in the control unit 22
1The output high level, the supply access between closed described battery 5 and the quench heater 4 has namely been removed the guard mode of battery 5.Separate the releasing of the guard mode of 23 pairs of batteries 5 of lock unit, adopted the mode of hardware trigger, bring great convenience.
Present embodiment also provides a kind of battery management chip, comprises charging circuit and above-mentioned battery protecting circuit.The function of described charging circuit is prior art, repeats no more herein.
Present embodiment also provides a kind of magnetic resonance system, comprising: above-mentioned battery protecting circuit and magnet control unit, described magnet control unit is used for described battery protecting circuit is monitored.Below with the battery protecting circuit 2 among Fig. 3 ' be example, the magnetic resonance system of present embodiment is described.
Among Fig. 3, magnet control unit 9 also is used for receiving the quench switch SW
1The signal that sends, and feedback controls signal to quench control circuit 3 accordingly to drive described quench heater 4 work or to make described quench heater 4 quit work.Described main power source 7 is supplied with by general supply 8, and simultaneously, described general supply 8 is also to described magnet control unit 9 power supplies.As shown in Figure 3, adopt 9 pairs of described battery protecting circuits 2 of described magnet control unit ' when monitoring, at first send a control signal to the 3rd triode TR by described magnet control unit 9
3, close described the 3rd triode TR
3, so that described general supply 8 stops main power source 7 power supplies, the 3rd triode TR described in the present embodiment
3Be the positive-negative-positive triode.After main power source 7 power down; 9 pairs of described battery protecting circuits 2 of described magnet control unit ' test; particularly; as shown in Figure 3; described magnet control unit 9 couples with first end of described quench heater 4; and described magnet unit 9 also couples (not shown) with ground, during test, and described quench switch SW
1Disconnect; therefore; there is little electric current in the supply access between described battery 5 and the described quench heater 4; described magnet control unit 9 is tested the voltage at described quench heater 4 two ends in having the loop of little electric current; if there is voltage in described quench heater 4 two ends; described battery protecting circuit 2 ' can operate as normal then, the power supply that can recover 8 pairs of main power sources 7 of described general supply.If there is not voltage in described quench heater 4 two ends, then produce alarm signal.
In the present embodiment; cut off the power supply of 7 pairs of described quench heaters 4 of main power source earlier by described magnet control unit 9; then by 9 pairs of described battery protecting circuits 2 of described magnet control unit ' monitor, guaranteed the reliability of described battery protecting circuit 2 ' in running.
In sum, the battery protecting circuit that the utility model embodiment provides, battery management chip, magnetic resonance system have following beneficial effect at least:
Described battery protecting circuit comprises: partial pressure unit, reference voltage generation unit and control unit; cooperation by the three on the one hand can so that battery electric quantity cross when low; supply access between battery and the load is disconnected; improve the life-span of battery; also prevent the startup repeatedly of the load that the rise owing to cell voltage causes on the other hand, improved the life-span of load.By the relation that couples between each device and load and the battery in the described control unit; make described battery protecting circuit under situation about losing efficacy; main power source still can be to described load power supply; when described load is the quench heater; both improve the probability of described quench heater operate as normal, also avoided the serious consequence that causes because of described quench heater cisco unity malfunction.
In specific embodiment; described battery protecting circuit also comprises the solution lock unit; mode by hardware trigger is carried out release to the guard mode of battery, owing to need not by the mode of manual or software the guard mode of battery to be removed, brings great convenience.
Battery protecting circuit comprises partial pressure unit, reference voltage generation unit and control unit, and circuit structure is simple, and cost is low and power consumption is little.
Described magnetic resonance system comprises magnet control unit and battery protecting circuit, and can monitor described battery protecting circuit by described magnet control unit operate as normal, has guaranteed the reliability in the described battery protecting circuit running.
Though the utility model with preferred embodiment openly as above; but it is not to limit the utility model; any those skilled in the art are not in breaking away from spirit and scope of the present utility model; can utilize method and the technology contents of above-mentioned announcement that technical solutions of the utility model are made possible change and modification; therefore; every content that does not break away from technical solutions of the utility model; to any simple modification, equivalent variations and modification that above embodiment does, all belong to the protection range of technical solutions of the utility model according to technical spirit of the present utility model.
Claims (10)
1. a battery protecting circuit comprises: partial pressure unit, reference voltage generation unit, control unit; Described partial pressure unit is exported the voltage of described battery to described control unit; Described reference voltage generation unit provides reference voltage to described control unit; Described control unit is voltage and the described reference voltage of battery relatively, controls the supply access of described battery and load; It is characterized in that,
Described control unit comprises: comparator, the 4th resistance, the 5th resistance, the 6th resistance and transistor; Wherein,
The in-phase input end of described comparator is imported the voltage of described battery, and inverting input is imported described reference voltage;
First end of described the 4th resistance and the positive pole of described battery couple, and the output of second end and described comparator couples;
First end of described the 5th resistance and second end of described the 4th resistance couple, and second end and described transistorized grid couple;
First end of described the 6th resistance and second end of described the 5th resistance couple, second end with couple; Second end of described transistor drain and described the 6th resistance couples, source electrode and described load coupled.
2. battery protecting circuit as claimed in claim 1; it is characterized in that; also comprise: separate lock unit, described solution lock unit is controlled described reference voltage generation unit and is produced reference voltage so that the supply access between described control unit closure/described battery of disconnection and the load.
3. battery protecting circuit as claimed in claim 2 is characterized in that, described reference voltage generation unit comprises: the 3rd resistance and voltage-stabiliser tube; Wherein,
First end of described the 3rd resistance and first end of described the 4th resistance couple, and the second end output reference voltage is to the inverting input of described comparator;
First end of described voltage-stabiliser tube and second end of described the 3rd resistance couple, second end with couple.
4. battery protecting circuit as claimed in claim 3 is characterized in that, described solution lock unit comprises: the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, first triode, second triode and amplifier; Wherein,
First end of described the 7th resistance and first end of described the 4th resistance couple, and first end of second end and described the 8th resistance couples;
Second end of described the 8th resistance and described transistorized source electrode couple;
Second end of the in-phase input end of described amplifier and described the 7th resistance couples, and second end of inverting input and described the 8th resistance couples, and first end of output and described the 9th resistance couples;
Second end of described the 9th resistance, first end of the tenth resistance couple with the base stage of described first triode respectively;
Second end of described the tenth resistance with couple;
The collector electrode of the collector electrode of described first triode, second triode couples with second end of described voltage-stabiliser tube respectively, and the emitter of the emitter of described first triode, second triode couples with ground respectively;
First end of described the 11 resistance and the base stage of described second triode couple, second end with couple;
First end of described the 12 resistance and the base stage of described second triode couple, and first end of second end and described the 5th resistance couples.
5. battery protecting circuit as claimed in claim 4 is characterized in that, described first triode, second triode are NPN type triode.
6. battery protecting circuit as claimed in claim 4 is characterized in that, described solution lock unit also comprises: first electric capacity and second electric capacity; Wherein,
First end of described first electric capacity and the base stage of described first triode couple, second end with couple;
First end of described second electric capacity and the base stage of described second triode couple, second end with couple.
7. battery protecting circuit as claimed in claim 1 is characterized in that, described partial pressure unit comprises; First resistance and second resistance; Wherein,
First end of described first resistance and the positive pole of described battery couple, and the voltage of second end output battery is to the in-phase input end of described comparator;
First end of described second resistance and second end of described first resistance couple, second end with couple.
8. battery protecting circuit as claimed in claim 1 is characterized in that, described transistor is nmos pass transistor.
9. a battery management chip comprises charging circuit, it is characterized in that, also comprises:
Each described battery protecting circuit of claim 1-8.
10. a magnetic resonance system is characterized in that, comprising:
Each described battery protecting circuit of claim 1-8;
The magnet control unit is used for described battery protecting circuit is monitored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320061331 CN203151081U (en) | 2013-02-04 | 2013-02-04 | Battery protection circuit, battery management chip and magnetic resonance system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320061331 CN203151081U (en) | 2013-02-04 | 2013-02-04 | Battery protection circuit, battery management chip and magnetic resonance system |
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| CN203151081U true CN203151081U (en) | 2013-08-21 |
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| CN 201320061331 Expired - Lifetime CN203151081U (en) | 2013-02-04 | 2013-02-04 | Battery protection circuit, battery management chip and magnetic resonance system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336890A (en) * | 2022-01-13 | 2022-04-12 | 无锡市晶源微电子有限公司 | Battery discharge protection device |
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2013
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336890A (en) * | 2022-01-13 | 2022-04-12 | 无锡市晶源微电子有限公司 | Battery discharge protection device |
| CN114336890B (en) * | 2022-01-13 | 2023-09-08 | 无锡市晶源微电子股份有限公司 | Battery discharge protection device |
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Address after: 201815 No. 1180 Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee after: Shanghai Lianying Medical Technology Co.,Ltd. Address before: 201815 No. 1180 Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |
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Granted publication date: 20130821 |