CN214204995U - Battery power supply protection circuit and battery power supply system - Google Patents
Battery power supply protection circuit and battery power supply system Download PDFInfo
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- CN214204995U CN214204995U CN202022805318.0U CN202022805318U CN214204995U CN 214204995 U CN214204995 U CN 214204995U CN 202022805318 U CN202022805318 U CN 202022805318U CN 214204995 U CN214204995 U CN 214204995U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
Abstract
The application discloses battery power supply protection circuit and battery power supply system, this battery power supply protection circuit are used for controlling the power supply circuit who supplies power for Battery Management System (BMS) and battery, and this battery power supply protection circuit includes: and the transient suppression branch circuit and/or the steady-state protection branch circuit are arranged on the power supply circuit. Wherein, transient state suppression branch road can effectively restrain the transient state overvoltage rush on the supply circuit, and the overvoltage separation is carried out under the circumstances that steady state protection branch road can be filled into the BMS and the battery of rear end at supply circuit upper stable state high pressure, plays the guard action to make the voltage of supplying power for BMS and battery be injectd within the safe value, realize the safety protection to BMS and battery at the charge-discharge in-process, the reliability is high, can effectively avoid because of the battery failure that BMS became invalid and lead to.
Description
Technical Field
The application relates to the field of battery control, in particular to a battery power supply protection circuit and a battery power supply system.
Background
In the related art, a Battery is usually protected by charging and discharging based on a Battery Management System (BMS), for example, by collecting and calculating parameters such as voltage, current, temperature, and SOC (state of charge), the charging and discharging process of the Battery is controlled, the Battery is protected, and if an external abnormal high voltage causes damage to an internal power device of the BMS, the BMS is disabled, and the Battery is also disabled.
In the related art, considering that the BMS cannot bear high voltage in the working process, the BMS and the battery are often powered based on an isolated power supply circuit, but the isolated power supply circuit needs to adopt a transformer, which is difficult to apply to a scene with limited space, and in addition, high voltage after the magnetic core of the transformer is saturated or the insulation voltage resistance fails is coupled to the rear end, thereby causing the BMS and the battery to fail.
SUMMERY OF THE UTILITY MODEL
In view of this, embodiments of the present application provide a battery-powered protection circuit and a battery-powered system, which aim to effectively protect a BMS and a battery.
The technical scheme of the embodiment of the application is realized as follows:
the embodiment of the application provides a battery power supply protection circuit for control the power supply circuit who supplies power for Battery Management System (BMS) and battery, battery power supply protection circuit includes: and the transient suppression branch circuit and/or the steady-state protection branch circuit are arranged on the power supply circuit.
In some embodiments, if the battery-operated protection circuit includes a transient suppression branch, the transient suppression branch includes: the transient suppression circuit comprises a transient suppression diode and a current-limiting resistor for limiting current, wherein the cathode of the transient suppression diode is connected with the anode power supply branch of the power supply circuit, the anode of the transient suppression diode is connected with the first end of the current-limiting resistor, and the second end of the current-limiting resistor is connected with the cathode power supply branch of the power supply circuit.
In some embodiments, the transient suppression branch further comprises: and the first end of the piezoresistor is connected with the cathode of the transient suppression diode, and the second end of the piezoresistor is connected with the second end of the current-limiting resistor.
In some embodiments, if the battery-operated protection circuit includes a steady-state protection branch, the steady-state protection branch includes: and the protection unit is used for blocking the power supply circuit or carrying out impedance adjustment on the power supply circuit.
In some embodiments, the protection unit includes at least one of a fuse, a thermal switch, and a thermistor disposed on the power supply circuit.
In some embodiments, the steady state protection branch further comprises: an accelerating unit for accelerating the protective effect of the protective unit.
In some embodiments, the acceleration unit comprises:
the parallel voltage stabilizing circuit is provided with a first state which is conducted when the power supply voltage of the power supply circuit is larger than a set threshold value and a second state which is cut off when the power supply voltage of the power supply circuit is smaller than the set threshold value;
and the base electrode of the switch tube is connected with the output end of the parallel voltage stabilizing circuit, and the collector electrode and the emitter electrode of the switch tube are connected between the anode power supply branch and the cathode power supply branch of the power supply circuit and used for being cut off when the parallel voltage stabilizing circuit is in a first state and being switched on when the parallel voltage stabilizing circuit is in a second state.
In some embodiments, a parallel voltage regulation circuit includes:
the first resistor and the second resistor are connected between the positive power supply branch and the negative power supply branch;
the reference electrode of the voltage stabilizing chip is connected to the joint of the first resistor and the second resistor, the cathode of the voltage stabilizing chip is connected with the anode power supply branch, and the anode of the voltage stabilizing chip is connected with the cathode power supply branch;
wherein, the base electrode of the switch tube is connected with the cathode of the voltage stabilizing chip.
In some embodiments, a battery-powered protection circuit includes: the transient suppression protection system comprises a transient suppression branch and a steady-state protection branch, wherein the transient suppression branch is positioned in front of the steady-state protection branch or the transient suppression branch is positioned behind the steady-state protection branch.
An embodiment of the present application further provides a battery power supply system, including: the power supply circuit is used for supplying power to the BMS and the battery power supply protection circuit of the embodiment of the application.
In some implementations, the power supply circuit is a non-isolated power supply circuit.
The technical scheme that this application embodiment provided, because set up transient state suppression branch road and/or steady state protection branch road on the supply circuit of power supply for BMS and battery, wherein, transient state suppression branch road can effectively suppress the transient state overvoltage impact on the supply circuit, steady state protection branch road can carry out the overvoltage crowning under the condition that the steady state high pressure pours into the BMS and the battery of rear end on the supply circuit, play the guard action, thereby make the voltage of power supply for BMS and battery be injectd within the safe value, realize the safety protection to BMS and battery at the charge-discharge in-process, the reliability is high, can effectively avoid the battery inefficacy because of BMS inefficacy leads to.
Drawings
Fig. 1 is a schematic structural diagram of a battery power protection circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a battery power supply system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a battery power supply system according to a second embodiment of the present application;
FIG. 4 is a schematic structural diagram of a three-battery power supply system according to an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a four-battery power supply system according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a five-battery power supply system according to an embodiment of the present application;
FIG. 7 is a schematic structural diagram of a six-battery power supply system according to an embodiment of the present application;
FIG. 8 is a schematic structural diagram of a seven-battery power supply system according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of an eight-battery power supply system according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a nine-battery power supply system according to an embodiment of the present application.
Description of reference numerals:
101. a rectifying unit; 102. a power conversion unit;
2. a battery-powered protection circuit; 21. a transient suppression branch; 22. a steady state protection branch;
221. a protection unit; 222. an acceleration unit; 3. BMS and battery.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Where in the description of the present application reference has been made to the terms "first", "second", etc. merely to distinguish between similar items and not to indicate a particular ordering for the items, it is to be understood that "first", "second", etc. may be interchanged with respect to a particular order or sequence of events to enable embodiments of the application described herein to be performed in an order other than that illustrated or described herein. Unless otherwise indicated, "plurality" means at least two.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the correlation technique, often carry out charge and discharge protection to the battery based on the BMS, if there are abnormal phenomena such as overvoltage impact in the power supply circuit who supplies power for BMS and battery, probably lead to BMS internal power device to damage, and then make BMS inefficacy or even battery inefficacy.
Based on this, in various embodiments of the present application, a battery power supply protection circuit is provided to control a power supply circuit that supplies power to the BMS and the battery, so as to effectively protect the BMS and the battery during charging and discharging of the power supply circuit.
As shown in fig. 1, in the embodiment of the present application, a power supply circuit may convert ac power input by a commercial power source into dc power to supply power to the BMS and the battery 3, and the power supply circuit includes: a rectifying unit 101 and a power conversion unit 102, wherein the rectifying unit 101 is used for converting the alternating current input by L (live wire) and N (neutral wire) into a first direct current, and the power conversion unit 102 may be a Buck conversion circuit (Buck circuit) for converting the first direct current into a suitable second direct current to supply power to the BMS and the battery 3.
The embodiment of the application provides a battery power supply protection circuit, and the battery power supply protection circuit 2 is connected into a power supply circuit supplying power to a BMS and a battery 3 and used for controlling the power supply circuit. As shown in fig. 1, the battery-operated protection circuit 2 includes: a transient suppression branch 21 and/or a steady-state protection branch 22 arranged on the supply circuit.
Because set up transient state on the power supply circuit that supplies power for BMS and battery 3 and restrain branch 21 and/or steady state protection branch 22, wherein, transient state on the power supply circuit overvoltage impact can effectively be restrained to transient state suppression branch 21, steady state protection branch 22 can be on the power supply circuit steady state high pressure pour into the BMS and the battery 3 of rear end under the condition carry out the overvoltage blocking, play the guard action, thereby make the voltage of supplying power for BMS and battery be injectd within the safe value, realize the safety protection to BMS and battery at the charging and discharging in-process, the reliability is high, can effectively avoid the battery inefficacy because of BMS inefficacy leads to.
In some embodiments, the transient suppression branch 21 comprises: the Transient Voltage Suppressor comprises a Transient Voltage Suppressor (TVS) and a current-limiting resistor for limiting current, wherein the cathode of the Transient Voltage Suppressor is connected with the anode power supply branch of the power supply circuit, the anode of the Transient Voltage Suppressor is connected with the first end of the current-limiting resistor, and the second end of the current-limiting resistor is connected with the cathode power supply branch of the power supply circuit. Here, when the two poles of the transient suppression diode are impacted by reverse transient high energy, the discharge tube releases energy outwards through the process from glow to arc, so as to absorb an overvoltage spike, and a voltage clamp between the two poles is located in a preset range. Here, the current limiting resistor may protect the transient suppression diode by limiting the current. So, can be so that the voltage of supplying power for BMS and battery 3 is injectd within the safe value, realize BMS and battery safety protection at the charge-discharge in-process, the reliability is high, can effectively avoid because of the battery failure that BMS became invalid and lead to.
In practical application, if the power supply circuit is subjected to external electrostatic coupling or lightning surge, the transient suppression diode in the transient suppression branch 21 can absorb the nanosecond (ns) level overvoltage impact, so that the transient overvoltage impact can be suppressed, and the reliability of the power supply circuit can be improved.
In some embodiments, the transient suppression branch 21 further comprises: and the first end of the piezoresistor is connected with the cathode of the transient suppression diode, and the second end of the piezoresistor is connected with the second end of the current-limiting resistor. Here, the voltage dependent resistor refers to a resistor device with nonlinear current-voltage characteristics, which is used for clamping voltage when the circuit is subjected to overvoltage, and absorbing redundant current to protect a sensitive device. It can be understood that when an overvoltage occurs between the two poles of the voltage dependent resistor, the voltage dependent resistor can clamp the voltage to a relatively fixed voltage value, thereby protecting the subsequent circuit. Therefore, the over-pulse voltage (such as ns level) on the power supply circuit can be absorbed by the transient suppression diode firstly and then further absorbed by the piezoresistor, for example, the microsecond (us) level surge voltage can be further absorbed by the piezoresistor, so that the protection reliability is enhanced.
In some embodiments, the steady state protection branch 22 includes: a protection unit 221 for blocking the power supply circuit or performing impedance adjustment on the power supply circuit. Here, the protection unit 221 may include at least one of a fuse, a thermal switch, and a thermistor provided on the power supply circuit. It is understood that the protection unit 221 may be connected to the positive supply branch and/or the negative supply branch of the power supply circuit. The protection unit 221 may be a fuse tube so as to be blown out when the supply voltage of the power supply circuit is continuously exceeded to protect the rear-stage BMS and the battery 3. The protection unit 221 may also be a thermal switch that is heated when the current flowing therethrough is over-limited, and disconnects the power supply circuit, thereby protecting the rear-stage BMS and the battery 3. The protection unit 221 may also be a thermistor that may increase an impedance with an increase in temperature, so that when the supply current of the power supply circuit is overcurrent, the rear-end voltage is limited to a safe value by increasing the impedance, thereby functioning to protect the BMS and the battery 3.
Here, for the steady-state overvoltage phenomenon in the power supply circuit, the steady-state protection branch 22 can block the power supply branch or increase the impedance of the power supply branch, thereby performing an overvoltage blocking function on the rear-end BMS and the battery 3, and thus effectively preventing the BMS and the battery 3 from failing.
In some embodiments, the steady state protection branch 22 further comprises: an acceleration unit 222 for accelerating the protection effect of the protection unit 221. Specifically, the accelerating unit 222 may block the protection unit 221 or increase the impedance adjustment amplitude of the protection unit 221, so that the protection rate may be further increased, and the protection effect on the rear-end BMS and the battery 3 may be enhanced.
Exemplarily, the acceleration unit 222 includes:
the parallel voltage stabilizing circuit is provided with a first state which is conducted when the power supply voltage of the power supply circuit is larger than a set threshold value and a second state which is cut off when the power supply voltage of the power supply circuit is smaller than the set threshold value;
and the base electrode of the switch tube is connected with the output end of the parallel voltage stabilizing circuit, and the collector electrode and the emitter electrode of the switch tube are connected in series between the anode power supply branch and the cathode power supply branch and are used for being cut off when the parallel voltage stabilizing circuit is in a first state and being conducted when the parallel voltage stabilizing circuit is in a second state.
Here, the switching transistor may be a MOS transistor (metal-oxide semiconductor field effect transistor) or an IGBT transistor (insulated gate bipolar transistor).
In this way, when the power supply voltage of the power supply circuit is greater than the set threshold, the switching tube is turned on, so that the current flowing through the protection unit 221 can be increased, the blocking of the protection unit 221 is accelerated, or the impedance adjustment amplitude of the protection unit 221 is increased, and the rear-end BMS and the battery 3 are effectively protected.
Illustratively, the parallel voltage stabilizing circuit includes:
the first resistor and the second resistor are connected between the positive power supply branch and the negative power supply branch;
the reference electrode of the voltage stabilizing chip is connected to the joint of the first resistor and the second resistor, the cathode of the voltage stabilizing chip is connected with the anode power supply branch, and the anode of the voltage stabilizing chip is connected with the cathode power supply branch;
the base electrode of the switching tube is connected with the cathode of the voltage stabilizing chip.
It can be understood that, when the power supply voltage of the power supply circuit is less than or equal to the set threshold, the voltage divided by the first resistor and the second resistor is not enough to trigger the voltage stabilizing chip, and the diode is cut off; when the power supply voltage of the power supply circuit is larger than a set threshold value, the voltage divided by the first resistor and the second resistor triggers the voltage stabilizing chip to be conducted, the cathode and the anode of the voltage stabilizing chip are conducted, and the diode is conducted. Here, the voltage stabilization chip may employ TL431 or the like.
In some embodiments, the transient suppression branch 21 is located before the steady-state protection branch 22 or the transient suppression branch 21 is located after the steady-state protection branch 22, that is, in the power supply circuit, the transient suppression branch 21 is disposed near the power conversion unit 102, the steady-state protection branch 22 is disposed at the rear end of the transient suppression branch 21, or the steady-state protection branch 22 is disposed near the power conversion unit 102, and the transient suppression branch 21 is disposed at the rear end of the steady-state protection branch 22, which is not limited in this application.
It can be understood that when the transient suppression branch 21 is located before the steady-state protection branch 22 (i.e. the steady-state protection branch 22 is located at the rear end of the transient suppression branch 21), i.e. the transient suppression branch 21 is located close to the power conversion unit 102, and the protection unit 221 and the acceleration unit 222 are located at the rear end of the transient suppression branch 21, the transient suppression branch 21 can absorb the overvoltage pulse on the power supply circuit in the nanosecond (ns) level, and the protection unit 221 and the acceleration unit 222 can protect the sustained overvoltage pulse.
It can be understood that when the transient suppression branch 21 is located behind the steady-state protection branch 22 (i.e. the transient suppression branch 21 is located at the rear end of the steady-state protection branch 22), i.e. the transient suppression branch 21 is located close to the positive output terminal V +, the negative output terminal V-, and the protection unit 221 and the acceleration unit 222 are located at the front end of the transient suppression branch 21, the transient suppression branch 21 can absorb the overvoltage electric pulse on the power supply circuit after being protected by the protection unit 221 and the acceleration unit 222.
An embodiment of the present application further provides a battery power supply system, including: a power supply circuit for supplying power to the BMS and the battery 3, and a battery power supply protection circuit of an embodiment of the present application.
In some embodiments, the power supply circuit is a non-isolated power supply circuit, which is beneficial to reducing the space occupied by the circuit. As shown in fig. 1, the power supply circuit includes: a rectifying unit 101 and a power conversion unit 102, wherein the rectifying unit 101 is used for converting the alternating current input by L (live wire) and N (neutral wire) into a first direct current, and the power conversion unit 102 may be a Buck conversion circuit (Buck circuit) for converting the first direct current into a suitable second direct current to supply power to the BMS and the battery 3.
In the embodiment of the application, because set up battery power supply protection circuit 2 on power supply circuit, this battery power supply protection circuit 2 can effectively absorb the overvoltage impact on the power supply circuit, and response time is fast, and the circuit is simple, and is small, and is with low costs, and then can realize the safety protection to BMS and battery 3 at the charge-discharge in-process, and the reliability is high, can effectively avoid the battery inefficacy because of BMS inefficacy leads to.
The present application will be described in further detail with reference to the following application examples.
Application embodiment 1
As shown in fig. 2, in this embodiment, the commercial power is rectified by the rectifying unit 101, filtered by the inductor L0, and then subjected to voltage reduction conversion by the power conversion unit 102 to output a direct current. The power conversion unit 102 includes a switching tube Q1, a filter circuit formed by an inductor L1 and a capacitor C1, and a freewheeling diode D1, and converts a dc voltage into a pulse voltage by controlling on and off of the switching tube Q1, and converts the pulse voltage into an output voltage (i.e., a voltage across two ends of the capacitor C1) after being filtered by the filter circuit formed by the inductor L1 and the capacitor C1, and a positive power supply branch is led out from a first end of the capacitor C1, and a negative power supply branch is led out from a second end of the capacitor C1.
As shown in fig. 2, the transient suppression branch 21 includes: transient suppression diode TVS1, current limiting resistor R0 and piezoresistor RV 1. The cathode of the transient suppression diode TVS1 is connected to the anode power supply branch, the anode of the transient suppression diode TVS1 is connected to the first end of the current limiting resistor R0, and the second end of the current limiting resistor R0 is connected to the cathode power supply branch; the first end of the piezoresistor RV1 is connected with the cathode of the transient suppression diode TVS1, and the second end of the piezoresistor RV1 is connected with the second end of the current-limiting resistor R0.
As shown in fig. 2, the protection unit 221 is a FUSE connected to the positive power supply branch.
After the power supply circuit is powered on, if there is an over-pulse voltage in the power supply circuit, the transient suppression diode TVS1 in the transient suppression branch 21 absorbs part of the energy of the over-pulse voltage, and meanwhile, the current limiting resistor R0 is used for limiting current, so as to protect the transient suppression diode TVS 1. After being absorbed by the transient suppression diode TVS1, the voltage dependent resistor RV1 at the rear stage further absorbs the over-pulse voltage, so that the voltage of the battery 3 and the BMS connected between the positive output terminal V + and the negative output terminal V-is limited within a safety value, and the protection effect is achieved. When there is a continuous overcurrent in the power supply circuit, the FUSE FUSEs, thereby protecting the rear-end BMS and the battery 3.
Application example two
As shown in fig. 3, the present application embodiment is added with an acceleration unit 222 on the basis of the application embodiment shown in fig. 2.
As shown in fig. 3, the acceleration unit 222 includes: the voltage stabilizing circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a voltage stabilizing chip IC1 and an NPN-type switching tube Q2, wherein the resistor R1 and the resistor R2 are connected between a positive power supply branch and a negative power supply branch, a reference electrode of a voltage stabilizing chip IC1 is connected to the connection position of the first resistor R1 and the second resistor R2, a cathode of the voltage stabilizing chip IC1 is connected with the positive power supply branch through a resistor R3, an anode of the voltage stabilizing chip is connected with the negative power supply branch, a collector of the switching tube Q2 is connected between a FUSE and a positive output terminal V +, a base of the switching tube Q2 is connected with a first end of a resistor R5, a second end of the resistor R5 is connected between a cathode of the voltage stabilizing chip IC1 and a resistor R3, and a second end of the resistor R5 is further connected to a collector of the switching tube Q2 through a resistor R4.
Here, the transient suppression branch 21 is disposed at the rear end of the FUSE, i.e., adjacent to the positive output terminal V +, and the negative output terminal V-.
When the voltage of the capacitor C1 is within a threshold point, for example, the threshold point is
The voltage division network formed by the resistor R1 and the resistor R2 is not enough to trigger the voltage stabilization chip IC1, the cathode and the anode of the voltage stabilization chip IC1 are cut off, no current is drawn out from the base of the diode Q2, the diode Q2 is in a cut-off state, and the circuit works normally. When the voltage of the capacitor C1 exceeds a threshold value, a voltage division network consisting of a resistor R1 and a resistor R2 triggers a voltage stabilization chip IC1, the cathode and the anode of the voltage stabilization chip IC1 are conducted, a resistor R3, a resistor R4 and a resistor R5 are pulled down and grounded, at the moment, the base of the diode Q2 draws current, a diode Q2 is conducted, the rear end of the FUSE FUSE is short-circuited, and when the FUSE value is reached, the loop is disconnected. It will be appreciated that if there is any residual voltage to the back end before the circuit is broken, the transient suppression branch 21 at the back end can continue to function as a protection based on the aforementioned operation mechanism. Therefore, the voltage stress of the transient suppression diode TVS1 and the voltage dependent resistor RV1 in the transient suppression branch 21 can be reduced, and the reliability is improved.
Application example three
As shown in fig. 4, in the present application embodiment, based on the application embodiment shown in fig. 3, the position of the transient suppression branch 21 is changed, and the transient suppression branch 21 is disposed near the capacitor C1, that is, disposed at the front end of the FUSE.
When the voltage of the capacitor C1 is within the threshold point, the voltage dividing network formed by the resistor R1 and the resistor R2 is not enough to trigger the voltage stabilizing chip IC1, the cathode and the anode of the voltage stabilizing chip IC1 are cut off, the diode Q2 does not have base electrode pull-out current, the diode Q2 is in a cut-off state, and the circuit works normally.
In practical application, in a dry environment or in a thunderstorm weather, high-voltage static electricity (ns level) and surge voltage (ns level and us level) are often easily coupled from a power supply port, when the voltage of the capacitor C1 exceeds a threshold point, the transient suppression diode TVS1 is instantly conducted to absorb pulses at the ns level, then the varistor RV1 is clamped according to the us level, and if residual energy or a steady-state high-voltage condition (such as failure of a front-end charger switching tube) exists at the moment, further protection can be performed through the FUSE at the rear end and the acceleration unit 222.
Application example four
As shown in fig. 5, in the present application embodiment, a FUSE is replaced with a thermal switch K on the basis of the application embodiment shown in fig. 2. Here, the thermo switch K may be heated when the current is over-limited, and disconnect the power supply circuit, thereby protecting the rear-stage BMS and the battery 3.
Application example five
As shown in fig. 6, in the present application embodiment, a FUSE is replaced with a thermal switch K on the basis of the application embodiment shown in fig. 3. Here, the thermo switch K may be heated when the current is over-limited, and disconnect the power supply circuit, thereby protecting the rear-stage BMS and the battery 3.
Application example six
As shown in fig. 7, in the present application embodiment, a FUSE is replaced with a thermal switch K on the basis of the application embodiment shown in fig. 4. Here, the thermo switch K may be heated when the current is over-limited, and disconnect the power supply circuit, thereby protecting the rear-stage BMS and the battery 3.
Application example seven
As shown in fig. 8, in the present application embodiment, the FUSE is replaced with the thermistor PTC based on the application embodiment shown in fig. 3. Here, the thermistor PTC and the acceleration unit 222 form an energy release circuit, when the normal voltage is charged, the switching tube Q2 is cut off, the resistance value of the thermistor PTC is a normal value, and the port voltage between the positive output terminal V + and the negative output terminal V-is normal at this time; when high voltage or pulse high voltage impact exists, the switching tube Q2 is conducted, the high voltage at the end of the capacitor C1 passes through an energy discharge loop consisting of the thermistor PTC and the switching tube Q2, the resistance value of the resistor PTC is increased instantly along with the rapid increase of the current at the two ends of the thermistor PTC, the impedance from the charging circuit to the battery port is increased, and the rear end voltage is limited in a safe value state, so that the BMS and the battery 3 are protected.
Application example eight
As shown in fig. 9, in the present application embodiment, the FUSE is replaced with the thermistor PTC in addition to the application embodiment shown in fig. 4.
Application example nine
As shown in fig. 10, in the present application example, in addition to the application example shown in fig. 9, the installation position of the thermistor PTC is adjusted, and the thermistor PTC is installed in the negative electrode power supply branch. It is understood that the FUSE or the thermal switch K in the foregoing embodiments may also be disposed on the negative power supply branch, and will not be described herein again.
It should be noted that: "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The technical means described in the embodiments of the present application may be arbitrarily combined without conflict.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (11)
1. A battery power protection circuit for controlling a power supply circuit for supplying power to a battery management system BMS and a battery, the battery power protection circuit comprising: and the transient suppression branch circuit and/or the steady-state protection branch circuit are arranged on the power supply circuit.
2. The battery-operated protection circuit of claim 1, wherein if the battery-operated protection circuit includes the transient suppression branch, the transient suppression branch comprises: the transient suppression circuit comprises a transient suppression diode and a current-limiting resistor for limiting current, wherein the cathode of the transient suppression diode is connected with the anode power supply branch of the power supply circuit, the anode of the transient suppression diode is connected with the first end of the current-limiting resistor, and the second end of the current-limiting resistor is connected with the cathode power supply branch of the power supply circuit.
3. The battery-powered protection circuit of claim 2, wherein the transient suppression branch further comprises: and the first end of the piezoresistor is connected with the cathode of the transient suppression diode, and the second end of the piezoresistor is connected with the second end of the current limiting resistor.
4. The battery-operated protection circuit of claim 1, wherein if the battery-operated protection circuit includes the steady-state protection branch, the steady-state protection branch comprises: and the protection unit is used for blocking the power supply circuit or carrying out impedance adjustment on the power supply circuit.
5. The battery-powered protection circuit of claim 4, wherein the protection unit comprises at least one of a fuse, a thermal switch, and a thermistor disposed on the power supply circuit.
6. The battery-operated protection circuit of claim 4, wherein the steady-state protection branch further comprises: an accelerating unit for accelerating the protective effect of the protective unit.
7. The battery-powered protection circuit of claim 6, wherein the acceleration unit comprises:
the parallel voltage stabilizing circuit is provided with a first state of conduction when the power supply voltage of the power supply circuit is greater than a set threshold value and a second state of cut-off when the power supply voltage of the power supply circuit is less than the set threshold value;
and the base electrode of the switch tube is connected with the output end of the parallel voltage stabilizing circuit, and the collector electrode and the emitter electrode of the switch tube are connected between the anode power supply branch and the cathode power supply branch of the power supply circuit and are used for being cut off when the parallel voltage stabilizing circuit is in the first state and being switched on when the parallel voltage stabilizing circuit is in the second state.
8. The battery-powered protection circuit of claim 7, wherein the parallel voltage regulation circuit comprises:
the first resistor and the second resistor are connected between the positive power supply branch and the negative power supply branch;
a reference electrode of the voltage stabilizing chip is connected to the joint of the first resistor and the second resistor, a cathode of the voltage stabilizing chip is connected with the positive power supply branch, and an anode of the voltage stabilizing chip is connected with the negative power supply branch;
and the base electrode of the switching tube is connected with the cathode of the voltage stabilizing chip.
9. The battery-operated protection circuit of claim 1, wherein the battery-operated protection circuit comprises: the transient suppression branch circuit is located before the steady-state protection branch circuit or the transient suppression branch circuit is located after the steady-state protection branch circuit.
10. A battery power supply system, comprising: a power supply circuit for supplying power to a BMS and a battery, and a battery power protection circuit according to any one of claims 1 to 9.
11. The battery power supply system of claim 10, wherein the power supply circuit is a non-isolated power supply circuit.
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| CN202022805318.0U CN214204995U (en) | 2020-11-26 | 2020-11-26 | Battery power supply protection circuit and battery power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116884121A (en) * | 2023-07-28 | 2023-10-13 | 浙江万超电器有限公司 | Novel intelligent key |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116884121A (en) * | 2023-07-28 | 2023-10-13 | 浙江万超电器有限公司 | Novel intelligent key |
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