CN114498905B - Power supply system with different power mode switching - Google Patents
Power supply system with different power mode switching Download PDFInfo
- Publication number
- CN114498905B CN114498905B CN202210187581.9A CN202210187581A CN114498905B CN 114498905 B CN114498905 B CN 114498905B CN 202210187581 A CN202210187581 A CN 202210187581A CN 114498905 B CN114498905 B CN 114498905B
- Authority
- CN
- China
- Prior art keywords
- power supply
- module
- power
- output
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention provides a power supply system for switching different power modes, which comprises: the first power supply module is used for outputting a first power supply voltage; the second power supply module is used for outputting a second power supply voltage; a battery management module; the main control module is used for starting according to the first power supply voltage after the power supply end of the system is powered on, establishing communication with the battery management module and entering a normal power operation mode; under the abnormal power operation mode, the main control module controls the second power supply module to output the second power supply voltage, and after detecting that the second power supply voltage is normally output, the main control module closes the first power supply voltage output by the first power supply module and controls the second power supply module to output a third power supply voltage. The invention adopts two power supplies with different powers and corresponding control circuits to realize power supply for the digital part circuit of the BMS in combination.
Description
Technical Field
The invention belongs to the technical field of power supply design, relates to a power supply system, and particularly relates to a power supply system with different power modes switched.
Background
Currently, the main power supply of the BMS (Battery Management System) is generally provided by a lithium Battery pack, which is a wide voltage input range. As the industry develops, the conventional BMS gradually increases a number of communication demands, such as isolated 485 communication, isolated CAN (Controller Area Network) communication, 4G communication, and the like. These requirements and the characteristics of the total voltage supply lead to the design of BMS power supplies that mainly select wide voltage input, high power output BUCK power management IC (Integrated Circuit) chips. When the battery pack is in a normal use state, the power consumption of the power supply can be ignored on the premise of ensuring the priority of functions. When the battery pack enters a stationary state, the BMS is generally required to reduce the overall power consumption, reducing unnecessary power waste. The conventional method is to turn off most digital circuits, such as 4G communication module, 485 or CAN communication module, and MCU enters sleep mode, when BMS current consumes the self-consuming current mainly concentrated on the power IC chip. When most digital circuits do not work, the requirement on the output power of the power supply only needs to meet the normal work of the MCU and peripheral digital circuits thereof. The power management IC chip does not provide the function of dynamically adjusting the output power.
Therefore, how to provide a power supply system with different power mode switching to solve the defects that the prior art cannot dynamically adjust the output power according to different power usage of the power supply in different application occasions, and the like, becomes a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a power supply system capable of switching between different power modes, so as to solve the problem that the output power cannot be dynamically adjusted due to different power consumption of the power supply in different applications in the prior art.
To achieve the above and other related objects, an aspect of the present invention provides a power supply system for switching different power modes, including: the first power supply module is connected with the power supply end of the system and used for outputting a first power supply voltage of first power; the second power supply module is connected with the power supply end of the system and used for outputting a second power supply voltage of second power; the first power is higher than the second power; the battery management module is used for managing the state information of the battery; the main control module is respectively connected with the first power supply module, the second power supply module and the battery management module, and is used for starting according to the first power supply voltage after the power supply end of the system is powered on, establishing communication with the battery management module and entering a normal power operation mode; under the abnormal power operation mode, the main control module controls the second power supply module to output the second power supply voltage, and after detecting that the second power supply voltage is normally output, the main control module closes the first power supply voltage output by the first power supply module and controls the second power supply module to output a third power supply voltage.
In an embodiment of the invention, the first power supply module includes a bootstrap circuit, a first output control circuit, and a voltage reduction module; after the system power supply end is powered on, the bootstrap circuit enables the voltage reduction module to output the first power supply voltage; and after the main control module detects that the second power supply voltage is normally output, the first power supply voltage output by the first power supply module is closed through the first output control circuit.
In an embodiment of the invention, when the second power supply module has an operation failure, the bootstrap circuit enables the voltage-reducing module to output the first supply voltage again.
In an embodiment of the invention, the power supply system with different power modes switching further includes: a first power conversion module; the first power supply voltage is input to the first power supply conversion module, and the output voltage of the first power supply conversion module supplies power to the main control module.
In an embodiment of the invention, the second power module includes a voltage reduction circuit, an output voltage feedback circuit, and a second output control circuit; the voltage reduction circuit outputs the second power supply voltage or the third power supply voltage under the control of the second output control circuit; the output voltage feedback circuit is used for ensuring the output stability of the second power supply voltage or the third power supply voltage.
In an embodiment of the present invention, the battery management module includes: the device comprises a battery management chip, a charging protection unit, a discharging protection unit and a current detection unit; the battery management chip is respectively connected with the charging protection unit, the discharging protection unit and the current detection unit.
In an embodiment of the present invention, the battery management chip and the main control module perform serial communication to transmit the state information of the battery to the main control module.
In an embodiment of the invention, the power supply system with different power modes switching further includes: the power supply comprises a second power supply conversion module and a third power supply conversion module; the main control module starts the second power supply conversion module and the third power supply conversion module when judging that the battery is in a charging or discharging state according to the state information of the battery transmitted by the battery management module; and the main control module closes the second power supply conversion module and the third power supply conversion module after detecting that the second power supply voltage is normally output.
In an embodiment of the invention, the power supply system with different power modes switching further includes: a 485 communication module and a 4G communication module; the second power supply conversion module is used for supplying power to the 485 communication module; and the third power supply conversion module is used for supplying power to the 4G communication module.
In an embodiment of the present invention, the main control module includes a voltage acquisition unit; under the abnormal power operation mode, the main control module controls the second power supply module to output the second power supply voltage, and after the voltage acquisition unit detects that the second power supply voltage is normally output, the main control module closes the first power supply voltage output by the first power supply module and controls the second power supply module to output a third power supply voltage.
As described above, the power supply system with different power modes switching according to the present invention has the following advantages:
(1) The real power consumption of the BMS is reduced from a hardware power supply, the frequency of the MCU is reduced from a software level in a non-traditional mode, the MCU enters a sleep mode, the communication module enters the sleep mode and the like, and the whole power consumption is reduced by reducing the power consumption of digital parts.
(2) The low-power supply is built by adopting discrete components such as MOS (metal oxide semiconductor) tubes and the like, and is simple to realize and low in cost by combining the advantages of PWM (pulse width modulation) control.
(3) The low power supply output is regulated in stages. In order to save the number of components and parts and cost, a general BMS 3.3V power supply system adopts a linear LDO mode. The self-consumption current and self-heating of the LDO are caused, the voltage difference between the input voltage and the output voltage is caused, and the output on-load current is in direct proportion, so that the loss of the power supply is reduced and the self-heating problem is solved by reducing the voltage difference between the input voltage and the output voltage of the LDO as much as possible on the basis of meeting the use requirement.
Drawings
Fig. 1 is a schematic structural diagram of a power supply system with different power modes being switched according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a power supply module of the power supply system with different power modes switched according to an embodiment of the invention.
Fig. 3 is a circuit diagram of a first power supply module of the power supply system with different power modes switching according to an embodiment of the invention.
Fig. 4 is a circuit diagram of a second power supply module of the power supply system with different power modes switching according to an embodiment of the invention.
Fig. 5 is a circuit diagram of a main control module of the power supply system with different power modes switching according to an embodiment of the invention.
Description of the element reference
1. Power supply system with different power mode switching
11. First power supply module
12. Second power supply module
13. Power supply management module
14. Main control module
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The power supply system for switching different power modes adopts two power supplies with different powers and corresponding control circuits, and realizes power supply for the digital part circuit of the BMS in a combined manner. The power supply switching circuit solves the problems that the power consumption of the power supply is reduced as much as possible in scenes of different power supplies and low-power sleep in different application occasions, and realizes power supply switching in different scenes by providing two power supplies with different powers and combining a peripheral control circuit.
The principle and implementation of the power supply system with different power modes switching according to the present embodiment will be described in detail below with reference to fig. 1 to 5, so that those skilled in the art can understand the power supply system with different power modes switching according to the present embodiment without creative efforts.
Referring to fig. 1, a schematic diagram of a power supply system with different power modes switching according to an embodiment of the invention is shown. As shown in fig. 1, the power supply system 1 for switching different power modes includes: a first power supply module 11, a second power supply module 12, a battery management module 13 and a main control module 14.
The first power supply module 11 is connected to a system power supply end, and is configured to output a first power supply voltage of a first power.
The second power supply module 12 is connected to the system power supply end, and is configured to output a second power supply voltage of a second power; the first power is higher than the second power.
The battery management module 13 is used for managing the state information of the battery.
The main control module 14 is connected to the first power supply module 11, the second power supply module 12, and the battery management module 13, and is configured to start up according to the first power supply voltage after the power supply end of the system is powered on, establish communication with the battery management module 13, and enter a normal power operation mode; in the abnormal power operation mode, the main control module 14 controls the second power supply module 12 to output the second power supply voltage, and after detecting that the second power supply voltage is normally output, the main control module closes the first power supply voltage output by the first power supply module 11, and controls the second power supply module 12 to output a third power supply voltage.
Referring to fig. 2, a circuit diagram of a power module of a power supply system with different power modes switching according to an embodiment of the invention is shown. As shown in fig. 2, in an embodiment, the power supply system for switching between different power modes further includes: the first power supply conversion module.
The first power supply voltage is input to the first power supply conversion module, and the output voltage of the first power supply conversion module supplies power to the main control module. Specifically, the first power conversion module in fig. 2 is a 3.3V power module, the first power supply voltage 10V/2A is input to the 3.3V power module, and the output voltage 3.3V/100mA of the 3.3V power module supplies power to the main control module.
In fig. 2, the first power supply module is a high power supply module, and the second power supply module is a low power supply module. After the system power supply end VIN _48V is powered on, the high-power supply module firstly outputs a first power supply voltage of 10V/2A, the first power supply voltage of 10V/2A is input into the 3.3V power supply module, and the output voltage of 3.3V/100mA of the 3.3V power supply module supplies power to the main control module, so that the main control module is started according to the first power supply voltage of 10V/2A, establishes communication with the battery management module and enters a normal power operation mode; and under the abnormal power operation mode, the main control module controls the low-power supply module to output the second power supply voltage of 11V/30mA, and after detecting that the second power supply voltage of 11V/30mA is normally output, the main control module closes the first power supply voltage of 10V/2A output by the high-power supply module and controls the low-power supply module to output the third power supply voltage of 5V/30mA.
Therefore, in fig. 2, the battery always supplies positive power VIN — 48V to the high-power wide-voltage input power module and the low-power wide-voltage input power module at the same time. The output 10V/2A of the high-power supply module can be connected to the isolated 5V power supply input, the isolated 3.8V power supply input and the isolated 3.3V power supply input. The output of the low-power voltage module is 11V/30mA or 5V/30mA, and is only connected to the input of a 3.3V power supply.
Referring to fig. 3, a circuit diagram of a first power module of the power supply system with different power modes switching according to an embodiment of the invention is shown. As shown in fig. 3, the first power supply module includes a bootstrap circuit, a first output control circuit, and a voltage reduction module. Specifically, the voltage reduction module is a wide-voltage high-power BUCK voltage reduction IC power supply module.
After the system power supply terminal VIN _48V is powered on, the bootstrap circuit enables the voltage reduction module to output the first power supply voltage of 10V/2A; and after detecting that the second power supply voltage is 11V/30mA and is normally output, the main control module closes the first power supply voltage of 10V/2A output by the first power supply module through the first output control circuit.
Referring to fig. 4, a circuit diagram of a second power supply module of the power supply system with different power modes switching according to an embodiment of the invention is shown. As shown in fig. 4, the second power supply module includes a voltage step-down circuit, an output voltage feedback circuit, and a second output control circuit.
The voltage reduction circuit outputs the second power supply voltage or the third power supply voltage under the control of the second output control circuit.
The output voltage feedback circuit is used for ensuring the output stability of the second power supply voltage or the third power supply voltage.
Specifically, in the low-power supply example shown in fig. 4, the peripheral circuit is composed of a digital adjustable PWM interface connected to the MCU, an output voltage feedback circuit, a freewheeling diode, a power inductor, and an output protection voltage regulator. The output voltage range is 5V-15V, and the output current is 30mA.
In an embodiment, when the second power module, i.e. the low power module, fails to operate, the bootstrap circuit enables the voltage reduction module to output the first supply voltage again.
Specifically, as shown in fig. 4, any one of the conditions of the transistor Q4 being damaged or the MCU itself being suddenly reset causes the PWM to interrupt the output, which may cause the low power consumption power supply output to be disconnected. At the moment of disconnection, as shown in fig. 3, CTRL1 connected to the MCU first changes to a high-resistance state, Q2 is in a non-conductive state, and at this time, the bootstrap circuit composed of PMOS Q1, voltage regulator DZ1, and resistor R1 is self-started under the driving of the external battery voltage VIN _48V, outputs power supply 10V, resumes the power supply of the MCU again, and the system resumes normal operation. Therefore, the bootstrap characteristic of the starting of the high-power supply module not only ensures that the low-power module realizes automatic regulation and optimized output according to the program design, but also increases the stable redundancy of the system power supply. When the low-power-consumption power module fails to operate.
Furthermore, the low power supply module is designed for low power consumption and has an output voltage feedback circuit, i.e. an analog quantity feedback output protection circuit. As shown in fig. 4, the transistor amplifying circuit composed of the NPN transistor Q4 can realize fast switching of the NMOS Q6, and reduce the loss current generated by the NMOS Q6. The output hardware negative feedback circuit consisting of R15, R16, R17, DZ4, D2, R14 and Q7 reduces the problems of untimely adjustment and overhigh output voltage caused by low PWM switching frequency of the MCU or improper programming of regulation software, and enhances the stability of the circuit.
Please refer to fig. 5, which illustrates a circuit diagram of a main control module of a power supply system with different power modes switching according to an embodiment of the present invention. As shown in fig. 5, the battery management module includes: the device comprises a battery management chip, a charging protection unit, a discharging protection unit and a current detection unit; the battery management chip is respectively connected with the charging protection unit, the discharging protection unit and the current detection unit.
In one embodiment, the battery management chip and the main control module perform serial communication, and transmit the state information of the battery to the main control module. Specifically, the serial communication is I2C (Inter-Integrated Circuit bus) communication, and the communication is performed by two lines of the SDL and SDA.
With continued reference to fig. 2, the power supply system with different power mode switching further includes: the second power supply conversion module and the third power supply conversion module.
The main control module starts the second power supply conversion module and the third power supply conversion module when judging that the battery is in a charging or discharging state according to the state information of the battery transmitted by the battery management module; and the main control module closes the second power supply conversion module and the third power supply conversion module after detecting that the second power supply voltage is normally output.
Specifically, in fig. 2, the second power conversion module is an isolated 5V power module, and the third power conversion module is a communication power module, that is, a 3.8V power module.
With continued reference to fig. 5, the power supply system with different power mode switching further includes: 485 communication module and 4G communication module.
The second power supply conversion module is used for supplying power to the 485 communication module; and the third power supply conversion module is used for supplying power to the 4G communication module. Specifically, the isolated 5V power module supplies power to the isolated 485 communication module; and the 3.8V power supply module supplies power to the 4G communication module.
In one embodiment, the main control module includes a voltage acquisition unit. Specifically, the main control module comprises an MCU main control chip, and the MCU main control chip realizes acquisition of second power supply voltage through a VOUT _ AIN pin and an internal related circuit.
Under the abnormal power operation mode, the main control module controls the second power supply module to output the second power supply voltage, and after the voltage acquisition unit detects that the second power supply voltage is normally output, the first power supply voltage output by the first power supply module is closed, and the second power supply module is controlled to output a third power supply voltage.
With reference to fig. 1 to 5, the working principle of the power supply system with different power mode switching according to the present invention is as follows:
the high-power supply module works: after the system is connected to 48V for power supply, when the MCU is not started to work, the high-power supply module P1 is started preferentially through a bootstrap circuit consisting of the PMOS Q1, the voltage regulator tube DZ1 and the resistor R1, and the power supply voltage is output to be 10V. And the 3.3V power supply module is started after being connected with 10V power supply, and the MCU is powered on. After the 5V isolation modules P3 and the 3.8V power supply module P4 are powered on, the power supply modules are in an off state initially by default, and need to be actively started under the control of the MCU.
Entering a normal power operation mode: and after the MCU is normally started, the MCU is communicated with the battery management IC chip U2 to acquire the voltage and current information of the battery. When the MCU judges that the battery is in a charging or discharging state according to the acquired battery pack information containing voltage and current information, the MCU starts the isolation 5V voltage module P3 and the isolation 3.8V power module P4 by controlling the output levels of CTRL2 and CTRL3, and supplies power to the isolation 485 communication module U3 and the isolation 4G communication module U4 respectively. At this time, the BMS is in a normal power operation mode.
A first stage of the low power module in the abnormal power operation mode: when the MCU judges that the battery pack cannot be charged or discharged due to faults or is in a standing state, the MCU outputs a low frequency PWM with the frequency being less than 10KHZ and the duty ratio being less than 10% to the control input port of the low-power supply module P2, and a second power supply voltage is output through a BUCK voltage reduction circuit consisting of a triode Q4, an NMOS Q6, a voltage stabilizing tube DZ3, a PMOS Q5, a freewheeling diode D3, a small power inductor L1, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a capacitor C5 and a capacitor C6.
A second stage of the low power module in the abnormal power operation mode: the second power supply voltage is divided into analog voltage VOUT _ AIN to an analog acquisition port AIN of the MCU through an analog voltage division acquisition circuit composed of R15, R16, R17, C7 and DZ 4. The MCU reads the input voltage value of the AIN, and when the current voltage output value is confirmed to be 1V higher than the power supply voltage 10V output by the high-power supply module after multiplying by the resistance voltage division ratio, the second power supply voltage 11V/30mA is detected, the MCU closes the input power supply of the high-power supply module by controlling the output level of the CTRL1 through a main closing circuit consisting of NMOS Q2, Q3, a common diode D1, a voltage stabilizing tube DZ2, resistors R2, R4, R5, R6 and R7, and accordingly the isolation 5V voltage module P3 and the 3.8V power supply module P4 do not work any more. At the moment, the low-power module PWM adjustment enters a second stage, the MCU modifies the PWM output duty ratio, and then the output voltage is reduced to be between 5V and 6V through the read VOUT _ AIN analog voltage value, so that the self consumption generated by the voltage difference between the input voltage and the output voltage of a 3.3V LDO (low dropout regulator) is reduced, and the BMS completely enters a system low-power consumption operation mode at the moment. Meanwhile, if the MCU regulates the PWM duty ratio output, when the VOUT _ AIN output value is too high due to the fact that the software programming logic is wrong or the PMW regulation precision is not properly set, a hardware regulation circuit which is connected with the VOUT _ AIN and consists of D2, R14 and Q7 is in effect, the Q7 is conducted, the PWM control does not work any more, the VOUT _ AIN output is pulled down, the problem that the hardware regulation output voltage is too high is solved, and the safety and the stability of the circuit are guaranteed.
And (3) recovering the normal power operation mode: when the BMS is in a low power consumption mode to a normal operation mode, only the output level of CTRL1 needs to be controlled, and after a time delay and waiting for a period of time, the MCU is closed to output PWM (pulse width modulation) to the low power consumption power supply.
The implementation apparatus of the power supply system with different power mode switching described in the present invention includes, but is not limited to, the structures of the modules listed in this embodiment, and all the structural modifications and substitutions in the prior art made according to the principles of the present invention are included in the scope of the present invention.
In summary, the power supply system for switching between different power modes of the present invention reduces the real power consumption of the BMS from a hardware power source, and reduces the MCU frequency from a software level in an unconventional manner, so that the MCU enters a sleep mode, and the communication module enters a sleep mode, etc. by reducing the power consumption of the digital components, the overall power consumption is reduced. The low-power supply is built by adopting discrete components such as MOS (metal oxide semiconductor) tubes and the like, and is simple to realize and low in cost by combining the advantages of PWM (pulse width modulation) control. The low power supply output is regulated in stages. In order to save the number of components and cost, a linear LDO mode is adopted in a general BMS 3.3V power supply system. Therefore, the self-consumption current and self-heating of the LDO are in direct proportion to the voltage difference between the input voltage and the output voltage, and the output carrying current, so that the loss of the power supply is reduced and the self-heating problem is solved by reducing the voltage difference between the input voltage and the output voltage of the LDO as much as possible on the basis of meeting the use requirement. The invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (10)
1. A power supply system switched between different power modes, comprising:
the first power supply module is connected with the power supply end of the system and used for outputting a first power supply voltage of first power;
the second power supply module is connected with the power supply end of the system and used for outputting a second power supply voltage of second power; the first power is higher than the second power;
the battery management module is used for managing the state information of the battery;
the main control module is respectively connected with the first power supply module, the second power supply module and the battery management module, and is used for starting according to the first power supply voltage after the power supply end of the system is powered on, establishing communication with the battery management module and entering a normal power operation mode; under the abnormal power operation mode, the main control module controls the second power supply module to output the second power supply voltage, and after detecting that the second power supply voltage is normally output, the main control module closes the first power supply voltage output by the first power supply module and controls the second power supply module to output a third power supply voltage.
2. A power supply system for switching between different power modes according to claim 1, characterized in that:
the first power supply module comprises a bootstrap circuit, a first output control circuit and a voltage reduction module;
after the system power supply end is powered on, the bootstrap circuit enables the voltage reduction module to output the first power supply voltage; and after the main control module detects that the second power supply voltage is normally output, the first power supply voltage output by the first power supply module is closed through the first output control circuit.
3. A power supply system for switching between different power modes according to claim 2, characterized in that:
when the second power supply module has operation failure, the bootstrap circuit enables the voltage reduction module to output the first supply voltage again.
4. A different power mode switching power supply system according to claim 1, further comprising: a first power conversion module;
the first power supply voltage is input to the first power supply conversion module, and the output voltage of the first power supply conversion module supplies power to the main control module.
5. A power supply system for switching between different power modes according to claim 1, wherein:
the second power supply module comprises a voltage reduction circuit, an output voltage feedback circuit and a second output control circuit;
the voltage reduction circuit outputs the second power supply voltage or the third power supply voltage under the control of the second output control circuit;
the output voltage feedback circuit is used for ensuring the output stability of the second power supply voltage or the third power supply voltage.
6. A power supply system of different power mode switching according to claim 1, wherein said battery management module comprises:
the device comprises a battery management chip, a charging protection unit, a discharging protection unit and a current detection unit;
the battery management chip is respectively connected with the charging protection unit, the discharging protection unit and the current detection unit.
7. The power supply system of claim 6, wherein:
the battery management chip is in serial communication with the main control module, and transmits the state information of the battery to the main control module.
8. The different power mode switching power supply system of claim 1, further comprising:
the power supply comprises a second power supply conversion module and a third power supply conversion module;
the main control module starts the second power supply conversion module and the third power supply conversion module when judging that the battery is in a charging or discharging state according to the state information of the battery transmitted by the battery management module; and the main control module closes the second power supply conversion module and the third power supply conversion module after detecting that the second power supply voltage is normally output.
9. The different power mode switching power supply system of claim 8, further comprising:
a 485 communication module and a 4G communication module;
the second power supply conversion module is used for supplying power to the 485 communication module;
and the third power supply conversion module is used for supplying power to the 4G communication module.
10. The power supply system of claim 1, wherein the master control module comprises a voltage acquisition unit;
under the abnormal power operation mode, the main control module controls the second power supply module to output the second power supply voltage, and after the voltage acquisition unit detects that the second power supply voltage is normally output, the main control module closes the first power supply voltage output by the first power supply module and controls the second power supply module to output a third power supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210187581.9A CN114498905B (en) | 2022-02-28 | 2022-02-28 | Power supply system with different power mode switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210187581.9A CN114498905B (en) | 2022-02-28 | 2022-02-28 | Power supply system with different power mode switching |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114498905A CN114498905A (en) | 2022-05-13 |
| CN114498905B true CN114498905B (en) | 2022-10-11 |
Family
ID=81485283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210187581.9A Active CN114498905B (en) | 2022-02-28 | 2022-02-28 | Power supply system with different power mode switching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114498905B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248217A (en) * | 2013-05-15 | 2013-08-14 | 西北工业大学 | Low-power dissipation FPGA (Field Programmable Gate Array) power supply |
| CN109936194A (en) * | 2019-04-01 | 2019-06-25 | 上海电气集团股份有限公司 | A kind of power supply circuit of battery management system |
| CN110932386A (en) * | 2019-12-20 | 2020-03-27 | 烟台科大正信电气有限公司 | Power supply system for primary and secondary integration intelligent feeder terminal |
| CN111381659A (en) * | 2018-12-29 | 2020-07-07 | 环达电脑(上海)有限公司 | Computer system and power management method |
| WO2021189937A1 (en) * | 2020-03-27 | 2021-09-30 | 深圳易马达科技有限公司 | Standby power supply circuit and power supply device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10442307B2 (en) * | 2017-07-19 | 2019-10-15 | Nio Usa, Inc. | Integrated power systems for electric vehicles |
| KR102443667B1 (en) * | 2018-10-26 | 2022-09-14 | 주식회사 엘지에너지솔루션 | balancing apparatus, and battery management system and battery pack including the same |
-
2022
- 2022-02-28 CN CN202210187581.9A patent/CN114498905B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248217A (en) * | 2013-05-15 | 2013-08-14 | 西北工业大学 | Low-power dissipation FPGA (Field Programmable Gate Array) power supply |
| CN111381659A (en) * | 2018-12-29 | 2020-07-07 | 环达电脑(上海)有限公司 | Computer system and power management method |
| CN109936194A (en) * | 2019-04-01 | 2019-06-25 | 上海电气集团股份有限公司 | A kind of power supply circuit of battery management system |
| CN110932386A (en) * | 2019-12-20 | 2020-03-27 | 烟台科大正信电气有限公司 | Power supply system for primary and secondary integration intelligent feeder terminal |
| WO2021189937A1 (en) * | 2020-03-27 | 2021-09-30 | 深圳易马达科技有限公司 | Standby power supply circuit and power supply device |
Non-Patent Citations (1)
| Title |
|---|
| 串联锂离子电池组均衡拓扑综述;蔡敏怡 等;《中国电机工程学报》;20210805;第41卷(第15期);第5294-5310页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114498905A (en) | 2022-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8085013B2 (en) | DC power converter and mode-switching method | |
| US6127815A (en) | Circuit and method for reducing quiescent current in a switching regulator | |
| US7626371B2 (en) | Power supply unit and portable device | |
| US6414403B2 (en) | Power unit | |
| US8593115B2 (en) | Bidirectional power converters | |
| US8687392B2 (en) | Power converter with automatic mode switching | |
| US6118254A (en) | Battery charge control architecture for constant voltage maximum power operation | |
| US8378626B2 (en) | Management device for charging circuit and wireless terminal | |
| CN109617039B (en) | Power receiving equipment and power over Ethernet system | |
| KR20130009599A (en) | Battery charging apparatus with a common control loop for a low drop-out voltage regulator and a boost regulator | |
| US7692939B2 (en) | Control circuit | |
| CN112286334B (en) | Low-power-consumption power supply switching circuit for MCU and implementation method thereof | |
| EP2786474A2 (en) | Integrated circuit device with integrated voltage controller | |
| CN114498905B (en) | Power supply system with different power mode switching | |
| TWI466410B (en) | Power supply system, voltage regulating apparatus and control method thereof | |
| JP2002101662A (en) | Power supply device | |
| CN213341709U (en) | Power supply circuit and system based on temperature controller | |
| CN113711482B (en) | Power management system and electronic device | |
| CN219833818U (en) | Power supply switching circuit and electronic equipment | |
| JP4878871B2 (en) | Power circuit | |
| CN214069583U (en) | Power supply self-switching device | |
| CN209805473U (en) | Control circuit and charger of power supply | |
| CN218733908U (en) | Intelligent bidirectional DC-DC switching circuit and uninterruptible power supply | |
| CN218976561U (en) | Power supply starting circuit for ATS | |
| CN219740192U (en) | Controller and isolated power converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |