CN115864567A - Low-power-consumption BMS power supply circuit, method, converter and storage medium - Google Patents
Low-power-consumption BMS power supply circuit, method, converter and storage medium Download PDFInfo
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Abstract
The method of the present invention provides a low power consumption BMS supply circuit, method, converter and storage medium, said circuit comprising at least: the first switch circuit, the first converter, the second switch circuit and the filtering and voltage stabilizing circuit are sequentially connected with the power supply; the second switch circuit is also connected with the main control power supply circuit; the first converter is used for reducing the voltage at the end of the first switch circuit and regulating and controlling the voltage through the second switch circuit to obtain a preset voltage; one path of the preset voltage is transmitted to the filtering voltage stabilizing circuit for supplying power to a load, and the other path of the preset voltage is transmitted to the main control power supply circuit for supplying power to the MCU module. The invention can stably obtain a power supply, and simultaneously enters an extremely low power consumption mode according to the condition that the voltage of any cell is extremely low, thereby effectively avoiding the permanent damage of the cell due to over-discharge and prolonging the service life of the lithium battery.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a low-power-consumption BMS power supply circuit, a method, a converter and a storage medium.
Background
In recent years, since lithium batteries have incomparable advantages in terms of energy density, cycle life, charging speed and the like, the application fields of the lithium batteries are wider and wider, and the lithium batteries basically cover the aspects of human activities from the initial mobile phones and 3C, the subsequent electric tools, the present electric automobiles, large-scale energy storage and the like. However, unlike secondary batteries such as lead-acid, nickel-cadmium, and nickel-hydrogen batteries, lithium batteries must be considered for safety during charging and discharging to prevent the electrochemical characteristics from being out of control and even the batteries from being burned out. Therefore, the monitoring and the protection of the lithium ion battery are very important in the use process, and the faults of overcharge, overdischarge, over-temperature, overcurrent, short circuit and the like of the battery are avoided, so that the aims of improving the safety performance of a product and prolonging the service life of the battery are finally fulfilled. Under the background, a Battery Management System (BMS) has been developed and plays an important role of 'battery manager'. The good monitoring and protecting functions of the BMS on the lithium ion battery are established on the stable and reliable operation of the BMS, and the normal work of the BMS is ensured, and the stable and reliable power supply of the BMS is ensured. At present, two mainstream power supply modes are provided, one is power supply by a battery cell, and the other is power supply by an external power supply, but the two power supply modes have defects, for example, when the battery cell supplies power, the voltage of a certain battery cell is extremely low and even the battery cell is scrapped; and the adoption of an external power supply for power supply makes it difficult to conveniently obtain a stable power supply. Therefore, a reliable and stable BMS power supply system capable of effectively protecting the battery cell is needed.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a low power consumption BMS power supply circuit, method, converter and storage medium, which can stably obtain a power supply, and enter an extremely low power consumption mode according to a condition that a cell voltage of any cell is extremely low, and can effectively prevent the cell from being permanently damaged due to overdischarge, thereby improving the life of a lithium battery.
The invention provides a low-power consumption BMS power supply circuit, which at least comprises:
the first switch circuit, the first converter, the second switch circuit and the filtering and voltage stabilizing circuit are connected with the power supply in sequence.
The second switch circuit is also connected with the main control power supply circuit.
The first converter is used for reducing the voltage of the first switch circuit end and regulating and controlling the voltage through the second switch circuit to obtain a preset voltage.
One path of the preset voltage is transmitted to the filtering voltage stabilizing circuit for supplying power to a load, and the other path of the preset voltage is transmitted to the main control power supply circuit for supplying power to the MCU module.
Preferably, the first converter is a chip SCT2a10, and functions to step down the cell voltage.
Further, the first converter input comprises: a power supply pin Vm, an enable pin EN, a RON pin and a GND pin; the first converter output comprises: SW pin, BST pin, FGOOD pin, and FB pin.
Further, the first switch circuit includes at least:
a first input circuit for connection to a first power supply, said first input circuit being connected to said supply pin Vm.
And the second input circuit is used for being connected with the EN end of the MCU module and is connected with the enable pin EN.
The second input circuit is also connected to a second power supply.
Preferably, the first power supply is a battery cell, and the first input circuit is connected to a positive electrode of the battery cell.
Preferably, the second power supply is a charger power supply, and the second input circuit is connected to the positive electrode of the charger.
In a specific implementation process, the first input circuit is externally connected with a cell voltage anode, the first input circuit is connected with the power supply pin Vm, and the first input circuit is also connected with the capacitor C10 and grounded; the second input circuit is externally connected with the EN end of the MCU module, and is connected with a diode D1 in series and a resistor R1 in series to be connected to the enable pin EN; the second input circuit is also externally connected with the anode of a charger power supply, and is connected with the diode D2, the resistor R2 and the capacitor C11 in series to be connected to the output end of the resistor R1; the fifth resistor R5 is connected to the RON pin and grounded, and the GND pin is grounded.
Further, the second switch circuit at least includes:
with power inductance L1 that the SW pin is established ties, electric capacity C3 and electric capacity C8 are connected in parallel to power inductance L1's output, electric capacity C3 and electric capacity C8's output includes:
and the first output circuit is used for being connected with the filtering and voltage stabilizing circuit and is connected with an MOS (metal oxide semiconductor) tube Q1.
And the second output circuit is used for being connected with the main control power supply circuit.
And the third output circuit is used for being connected with the Enable end of the MCU module and is sequentially connected with a resistor R8, a resistor R4 and an NPN triode Q2 in series.
Preferably, the capacitor C3 and the capacitor C8 are filter capacitors.
In a specific implementation process, a power inductor L1 is connected to the SW pin in series, and a capacitor C3 is connected to the input end of the power inductor L1 and the BST pin in parallel; the output end of the power inductor L1 is connected in parallel with a capacitor C3 and a capacitor C8, for example, the output ends of the capacitor C3 and the capacitor C8 are connected to the Vmain end, and the Vmain end is divided into three parts: the first path is connected with an MOS tube Q1, and the output end of the MOS tube Q1 is connected with a filtering and voltage stabilizing circuit; the second path is connected with the main control power supply circuit; a third series resistor R8 and a resistor R4 are connected to a collector of an NPN triode Q2, a base electrode series resistor R3 of the NPN triode Q2 is connected with an Enable end of the MCU module, and an emitting electrode of the NPN triode Q2 is grounded.
Further, the filtering and voltage stabilizing circuit at least comprises:
a voltage stabilizing diode D3, a capacitor C4 and a capacitor C9 which are connected in parallel to the output end of the MOS tube Q1; the output end of the filtering voltage stabilizing circuit is used for connecting a load, and the other end of the filtering voltage stabilizing circuit is grounded.
Further, the master power supply circuit at least includes: the capacitor C1 and the capacitor C5 are connected to the input end of the second transformer in parallel, and the other ends of the capacitor C1 and the capacitor C5 are grounded; and the capacitor C2 and the capacitor C6 are connected to the output end of the second transformer in parallel, the output ends of the capacitor C2 and the capacitor C6 are used for being connected with a power supply port of the MCU module, and the other ends of the capacitor C2 and the capacitor C6 are grounded.
Preferably, the second transformer is HT7533-1.
An exemplary implementation of the low power BMS power supply circuit is as follows:
the battery cell voltage is input from a first input circuit, becomes high-frequency pulsating voltage after passing through a first converter, becomes constant voltage Vmain after passing through a power inductor L1 and filter capacitors C3 and C8 respectively, is divided into two paths, and one path of voltage is changed into a constant 5V power supply after passing through a switch tube Q1, filter capacitors C4 and C9 and a voltage regulator tube D3 to supply power for BMS communication and other load circuits; and the other path of the power supply is stepped down to 3.3V through a second transformer to provide power for the MCU module.
When the charger has voltage, the first converter enables, the circuit starts to work, vmain has stable voltage output, the voltage is changed into stable 3.3V after passing through the second transformer, the MCU starts to work after being electrified, and high level is output at the EN end and the Enable end, so that the stable power output of the whole power supply system is maintained.
When the BMS detects that the battery is not charged or discharged for a long time and does not communicate with the charger, the voltage of the Enable end is lowered, the power supply of the load circuit is turned off, the purpose of power saving is achieved, and meanwhile the MCU enters a low power consumption mode. During maintaining low-power consumption mode, in case detect certain economize on electricity core voltage extremely low, MCU will be at EN end output low level, and whole supply circuit will fall the electricity, and the system gets into extremely low-power consumption mode, and at this moment, whole BMS electric current just 2uA can effectively avoid electric core because the overdischarge is damaged forever, and until the charger opens, the second power has voltage, and supply circuit resumes work again.
It should be understood that existing BMS power supply designs either have the power core provide power to the BMS or an external power source provides power. However, both of the two power supply modes have disadvantages, for example, when the battery cell supplies power, because the BMS consumes power for a long time, less is more than 200uA, more is 100mA or even higher, and a certain battery cell has an extremely low voltage or even is scrapped, the invention can solve the problems.
As another preferred aspect, the present invention also provides a method for controlling a low power consumption BMS power supply circuit, the method including:
s1: acquiring the static time of the lithium battery; the static state includes: the lithium battery is free from a state of charge, discharge, and communication with the second power source.
S2: and when the time exceeds M hours, controlling the lithium battery to enter a low power consumption mode.
S3: and detecting the cell voltage in the first power supply of the lithium battery based on the low power consumption mode, and feeding the voltage back to the MCU module.
S4: and when the voltage of any battery cell is detected to be less than N volts, the lithium battery is controlled to enter an extremely low power consumption mode, so that low-power-consumption power supply of the BMS is realized.
Wherein M and N are natural numbers larger than zero.
Further, the low power consumption mode includes: and lowering the voltage of the Enable end of the MCU module, and closing the voltage output by the filtering and voltage stabilizing circuit, so as to achieve the purpose of power saving and realize the low power consumption mode.
The very low power consumption mode includes: and outputting a low level at the EN end of the MCU module, so that the whole power supply circuit of the lithium battery does not work, and the extremely low power consumption mode is realized.
According to the technical scheme, after the lithium battery is charged and activated, the MCU module is powered on to start working, normal power supply of the system is maintained, when the lithium battery is not charged or discharged and the state of communication with the charger is over M hours, the lithium battery is controlled to enter a low power consumption mode, based on the low power consumption mode, the cell voltage of the lithium battery is detected, when any cell voltage is detected to be smaller than N volts, the lithium battery is controlled to enter an extremely low power consumption mode, the whole system is powered off, and low power consumption power supply of the BMS is achieved.
It should be understood that the above method is applicable to a BMS power supply system, the system comprising at least:
the acquisition module is used for acquiring the static time of the lithium battery; the static state includes: the lithium battery is not in a state of charge, discharge, and communication with the second power source.
The detection module is used for detecting the cell voltage in the first power supply of the lithium battery in the low power consumption mode.
The control module is used for controlling the lithium battery to enter a low power consumption mode when the time exceeds M hours; and the battery controller is used for controlling the lithium battery to enter an extremely low power consumption mode when detecting that the voltage of any battery cell is less than N volts, so as to realize low-power-consumption power supply of the BMS, wherein M and N are natural numbers greater than zero.
As another preferable aspect, the present invention also provides a converter as the first converter in the low power consumption BMS power supply circuit described above.
As another preference, the present invention also provides a storage medium, located at any control unit, comprising a computer program executable by a processor for performing the method as described above.
Compared with the prior art, the beneficial effect of this scheme lies in:
according to the invention, according to the fact that the battery is not charged or discharged for a long time, the voltage of the Enable end is lowered, the power supply of the load circuit is turned off, the purpose of saving electricity is achieved, and meanwhile, the MCU module enters a low power consumption mode; and during the period of keeping the low power consumption mode, once the voltage of a certain power saving core is detected to be extremely low, the MCU module outputs a low level at the EN end, so that the whole power supply circuit is out of work when the power supply circuit is powered off, the system enters the extremely low power consumption mode, the power saving core is effectively protected from being permanently damaged, and the service life of the lithium battery is prolonged.
Drawings
Fig. 1 is a circuit diagram of a low power consumption BMS power supply circuit of the present invention.
Fig. 2 is a flowchart of a control method of the low power consumption BMS power supply circuit of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
Referring to fig. 1, in a preferred embodiment, a low power consumption BMS power supply circuit includes:
the first switch circuit, the first converter, the second switch circuit and the filtering and voltage stabilizing circuit are sequentially connected with the power supply.
The second switch circuit is also connected with the main control power supply circuit.
The first converter is used for reducing the voltage of the first switch circuit end and regulating and controlling the voltage through the second switch circuit to obtain a preset voltage.
One path of the preset voltage is transmitted to the filtering voltage stabilizing circuit for supplying power to a load, and the other path of the preset voltage is transmitted to the main control power supply circuit for supplying power to the MCU module.
Preferably, the first converter is a chip SCT2a10, and functions to step down the cell voltage.
Further, the first converter input comprises: a power supply pin Vm, an enable pin EN, a RON pin and a GND pin; the first converter output comprises: SW pin, BST pin, FGOOD pin, and FB pin.
Further, the first switch circuit includes at least:
a first input circuit for connection to a first power supply, said first input circuit being connected to said supply pin Vm.
And the second input circuit is used for being connected with the EN end of the MCU module and is connected with the enable pin EN.
The second input circuit is also connected to a second power supply.
Preferably, the first power supply is a battery cell, and the first input circuit is connected to a positive electrode of the battery cell.
Preferably, the second power supply is a charger power supply, and the second input circuit is connected to the positive electrode of the charger.
In a specific implementation process, the first input circuit is externally connected with a cell voltage anode, the first input circuit is connected with the power supply pin Vm, and the first input circuit is also connected with the capacitor C10 and grounded; the second input circuit is externally connected with the EN end of the MCU module, and is connected with a diode D1 and a resistor R1 in series to be connected to the enable pin EN; the second input circuit is also externally connected with the anode of a charger power supply, and is connected with the diode D2, the resistor R2 and the capacitor C11 in series to be connected to the output end of the resistor R1; the fifth resistor R5 is connected to the RON pin and grounded, and the GND pin is grounded.
Further, the second switch circuit includes at least:
with power inductance L1 that the SW pin is established ties, electric capacity C3 and electric capacity C8 are connected in parallel to power inductance L1's output, electric capacity C3 and electric capacity C8's output includes:
and the first output circuit is used for being connected with the filtering and voltage stabilizing circuit and is connected with an MOS (metal oxide semiconductor) tube Q1.
And the second output circuit is used for being connected with the main control power supply circuit.
And the third output circuit is used for being connected with the Enable end of the MCU module and is sequentially connected with a resistor R8, a resistor R4 and an NPN triode Q2 in series.
Preferably, the capacitor C3 and the capacitor C8 are filter capacitors.
In a specific implementation process, a power inductor L1 is connected to the SW pin in series, and a capacitor C3 is connected to the input end of the power inductor L1 and the BST pin in parallel; the output end of the power inductor L1 is connected in parallel with a capacitor C3 and a capacitor C8, for example, the output ends of the capacitor C3 and the capacitor C8 are connected to the Vmain end, and the Vmain end is divided into three parts: the first path is connected with an MOS tube Q1, and the output end of the MOS tube Q1 is connected with a filtering and voltage stabilizing circuit; the second path is connected with the main control power supply circuit; a third series resistor R8 and a resistor R4 are connected to the collector of the NPN triode Q2, a base series resistor R3 of the NPN triode Q2 is connected with the Enable end of the MCU module, and the emitter of the NPN triode Q2 is grounded.
Further, the filtering and voltage stabilizing circuit at least comprises:
a voltage stabilizing diode D3, a capacitor C4 and a capacitor C9 which are connected in parallel to the output end of the MOS tube Q1; the output end of the filtering voltage stabilizing circuit is used for connecting a load, and the other end of the filtering voltage stabilizing circuit is grounded.
Further, the master power supply circuit at least includes: the capacitor C1 and the capacitor C5 are connected to the input end of the second transformer in parallel, and the other ends of the capacitor C1 and the capacitor C5 are grounded; and the capacitor C2 and the capacitor C6 are connected to the output end of the second transformer in parallel, the output ends of the capacitor C2 and the capacitor C6 are used for being connected with a power supply port of the MCU module, and the other end of the capacitor C2 and the capacitor C6 is grounded.
Preferably, the second transformer is HT7533-1.
An exemplary implementation of the low power BMS power supply circuit is as follows:
the battery cell voltage is input from a first input circuit, becomes high-frequency pulsating voltage after passing through a first converter, becomes constant voltage Vmain after passing through a power inductor L1 and filter capacitors C3 and C8 respectively, is divided into two paths, and one path of voltage is changed into a constant 5V power supply after passing through a switch tube Q1, filter capacitors C4 and C9 and a voltage regulator tube D3 to supply power for BMS communication and other load circuits; and the other path of the voltage is reduced to 3.3V through a second transformer to provide power for the MCU module.
When the charger has voltage, the first converter enables, the circuit starts to work, vmain has stable voltage output, the voltage becomes stable 3.3V after passing through the second transformer, MCU starts to work after being electrified, and high levels are output at the EN end and the Enable end to maintain the stable power output of the whole power supply system.
When the BMS detects that the battery is not charged or discharged for a long time and does not communicate with the charger, the voltage of the Enable end is lowered, the power supply of the load circuit is turned off, the purpose of power saving is achieved, and meanwhile the MCU enters a low power consumption mode. During maintaining low-power consumption mode, in case it is extremely low to detect a certain economize on electricity core voltage, MCU will be at EN end output low level, and whole supply circuit will fall the electricity, and the system gets into extremely low-power consumption mode, and at this moment, whole BMS electric current just 2uA can effectively avoid electric core because the overdischarge and be damaged forever, and until the charger opens, the second power has voltage, and supply circuit resumes work again.
It should be understood that existing BMS power supply designs either have the power core provide power to the BMS or an external power source provides power. However, both of the two power supply modes have disadvantages, for example, when the battery cell supplies power, because the BMS consumes power for a long time, less is more than 200uA, more is 100mA or even higher, and a certain battery cell has an extremely low voltage or even is scrapped, the invention can solve the problems.
As another preferred aspect, the present invention also provides a method for controlling a low power consumption BMS power supply circuit, the method including:
s1: acquiring the static time of the lithium battery; the static state includes: the lithium battery is free from a state of charge, discharge, and communication with the second power source.
S2: and when the time exceeds M hours, controlling the lithium battery to enter a low power consumption mode.
S3: and detecting the cell voltage in the first power supply of the lithium battery based on the low power consumption mode, and feeding the voltage back to the MCU module.
S4: and when the voltage of any battery cell is detected to be less than N volts, the lithium battery is controlled to enter an extremely low power consumption mode, so that low-power-consumption power supply of the BMS is realized.
Wherein M and N are natural numbers larger than zero.
Further, the low power consumption mode includes: and lowering the voltage of the Enable end of the MCU module, and closing the voltage output by the filtering and voltage stabilizing circuit, so as to achieve the purpose of power saving and realize the low power consumption mode.
The very low power consumption mode includes: and outputting a low level at the EN end of the MCU module, so that the whole power supply circuit of the lithium battery does not work, and the extremely low power consumption mode is realized.
Referring to fig. 2, in a preferred embodiment, after the lithium battery is charged and activated, the MCU module is powered on to start working, so as to maintain normal power supply of the system, and when the lithium battery is not charged or discharged and the state of no communication with the charger is over M hours, the lithium battery is controlled to enter a low power mode, based on the low power mode, the cell voltage of the lithium battery is detected, and when it is detected that any cell voltage is less than N volts, the lithium battery is controlled to enter an extremely low power mode, and the whole system is powered down, so as to implement low power supply of the BMS.
It should be understood that the above method is applicable to a BMS power supply system, the system comprising at least:
the acquisition module is used for acquiring the static time of the lithium battery; the static state includes: the lithium battery is not in a state of charge, discharge, and communication with the second power source.
The detection module is used for detecting the cell voltage in the first power supply of the lithium battery in the low power consumption mode.
The control module is used for controlling the lithium battery to enter a low power consumption mode when the time exceeds M hours; and the battery controller is used for controlling the lithium battery to enter an extremely low power consumption mode when detecting that the voltage of any battery cell is less than N volts, so as to realize low-power-consumption power supply of the BMS, wherein M and N are natural numbers greater than zero.
As another preferable aspect, the present invention also provides a converter as the first converter in the low power consumption BMS power supply circuit described above.
As another preference, the present invention also provides a storage medium, located at any control unit, comprising a computer program executable by a processor for performing the method as described above.
Compared with the prior art, the beneficial effect of this scheme lies in:
according to the invention, according to the fact that the battery is not charged or discharged for a long time, the voltage of the Enable end is lowered, the power supply of the load circuit is turned off, the purpose of saving electricity is achieved, and meanwhile, the MCU module enters a low power consumption mode; and during the period of keeping the low power consumption mode, once the voltage of a certain power saving core is detected to be extremely low, the MCU module outputs a low level at the EN end, so that the whole power supply circuit is out of work when power is lost, the system enters the extremely low power consumption mode, the power saving core is effectively protected from being permanently damaged, and the service life of the lithium battery is prolonged.
Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the foregoing illustrative embodiments are merely exemplary and are not intended to limit the scope of the invention thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as set forth in the appended claims.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The various system and method embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some of the modules according to embodiments of the present invention. The present invention may also be embodied as system programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on a computer readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
In the several embodiments provided in the present application, it should be understood that the disclosed system and method may be implemented in other ways. For example, the above-described system embodiments are merely illustrative, and for example, the division of functions is merely a logical division, and other divisions may be realized in practice, for example, multiple tools or components may be combined or integrated into another system, or some features may be omitted, or not executed.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the spirit and scope of the appended claims.
Claims (10)
1. A low-power consumption BMS supply circuit is applied to the lithium cell, its characterized in that, the circuit includes at least:
the first switch circuit, the first converter, the second switch circuit and the filtering and voltage stabilizing circuit are sequentially connected with the power supply;
the second switch circuit is also connected with the main control power supply circuit;
the first converter is used for reducing the voltage at the end of the first switch circuit and regulating and controlling the voltage through the second switch circuit to obtain a preset voltage;
one path of the preset voltage is transmitted to the filtering voltage stabilizing circuit for supplying power to a load, and the other path of the preset voltage is transmitted to the main control power supply circuit for supplying power to the MCU module.
2. The low power consumption BMS supply circuit of claim 1, characterized in that said first converter input comprises: a power supply pin Vm, an enable pin EN, a RON pin and a GND pin; the first converter output comprises: SW pin, BST pin, FGOOD pin, and FB pin.
3. The low power consumption BMS power supply circuit according to claim 2, characterized in that said first switching circuit comprises at least:
a first input circuit for connection to a first power supply, said first input circuit being connected to said supply pin Vm;
the second input circuit is used for being connected with the EN end of the MCU module and is connected with the enable pin EN;
the second input circuit is also connected to a second power supply.
4. The low power consumption BMS power supply circuit according to claim 3, characterized in that said second switching circuit comprises at least:
with power inductance L1 that the SW pin is established ties, electric capacity C3 and electric capacity C8 are connected in parallel to power inductance L1's output, electric capacity C3 and electric capacity C8's output includes:
the first output circuit is used for being connected with the filtering voltage stabilizing circuit and is connected with an MOS (metal oxide semiconductor) tube Q1;
the second output circuit is used for being connected with the master control power supply circuit;
and the third output circuit is used for being connected with the Enable end of the MCU module and is sequentially connected with a resistor R8, a resistor R4 and an NPN triode Q2 in series.
5. The BMS power supply circuit of claim 3, wherein the filtering regulation circuit comprises at least:
a voltage stabilizing diode D3, a capacitor C4 and a capacitor C9 which are connected in parallel to the output end of the MOS tube Q1; the output end of the filtering voltage stabilizing circuit is used for connecting a load, and the other end of the filtering voltage stabilizing circuit is grounded.
6. The BMS power supply circuit with low power consumption of claim 5, wherein the master power supply circuit comprises at least: the capacitor C1 and the capacitor C5 are connected to the input end of the second transformer in parallel, and the other ends of the capacitor C1 and the capacitor C5 are grounded;
and the capacitor C2 and the capacitor C6 are connected to the output end of the second transformer in parallel, the output ends of the capacitor C2 and the capacitor C6 are used for being connected with a power supply port of the MCU module, and the other end of the capacitor C2 and the capacitor C6 is grounded.
7. A control method applying the low power consumption BMS power supply circuit according to any one of claims 1 to 6, wherein the method comprises:
s1: acquiring the static time of the lithium battery; the static state includes: the lithium battery is not in a state of charge, discharge and communication with the second power supply;
s2: when the time exceeds M hours, controlling the lithium battery to enter a low power consumption mode;
s3: detecting the cell voltage in a first power supply of the lithium battery based on the low power consumption mode, and feeding the voltage back to the MCU module;
s4: when the voltage of any battery cell is detected to be less than N volts, the lithium battery is controlled to enter an extremely low power consumption mode, and low-power-consumption power supply of the BMS is realized;
wherein M and N are natural numbers larger than zero.
8. The method of claim 7,
the low power consumption mode includes: the voltage of an Enable end of the MCU module is set to be low, and the voltage output by the filtering voltage stabilizing circuit is closed, so that the purpose of saving electricity is achieved, and the low power consumption mode is realized;
the very low power consumption mode includes: and outputting a low level at the EN end of the MCU module, so that the whole power supply circuit of the lithium battery does not work, and the extremely low power consumption mode is realized.
9. A converter, characterized in that it is the first converter in the low power consumption BMS supply circuit according to any one of the claims 1-6.
10. A storage medium at any control unit, the storage medium comprising a computer program executable by a processor, the computer program being adapted to perform the method according to any of claims 7-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211459865.5A CN115864567A (en) | 2022-11-17 | 2022-11-17 | Low-power-consumption BMS power supply circuit, method, converter and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211459865.5A CN115864567A (en) | 2022-11-17 | 2022-11-17 | Low-power-consumption BMS power supply circuit, method, converter and storage medium |
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| Publication Number | Publication Date |
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| CN115864567A true CN115864567A (en) | 2023-03-28 |
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|---|---|---|---|
| CN202211459865.5A Pending CN115864567A (en) | 2022-11-17 | 2022-11-17 | Low-power-consumption BMS power supply circuit, method, converter and storage medium |
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| Country | Link |
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| CN (1) | CN115864567A (en) |
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