CN215646234U

CN215646234U - Dormancy awakening circuit based on optical coupling switch

Info

Publication number: CN215646234U
Application number: CN202121283286.0U
Authority: CN
Inventors: 王连海; 蔡金龙; 易小霞
Original assignee: Hangzhou Weiling Technology Co ltd
Current assignee: Hangzhou Weiling Technology Co ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2022-01-25
Anticipated expiration: 2031-06-09

Abstract

The utility model relates to a dormancy awakening circuit based on an optical coupling switch, which comprises a CAN signal input module, an optical coupling conduction module, an MOS (metal oxide semiconductor) tube control module and an MCU (microprogrammed control Unit) connection module, wherein the CAN signal input module comprises CANH/CANL for CAN communication and a first resistor playing a role in current limiting, the optical coupling conduction module comprises the optical coupling switch, the MOS tube control module comprises a first capacitor for storage, a second capacitor for filtering, a first MOS tube, a second resistor and a fourth resistor for awakening response time of the control circuit and a third resistor for voltage division, and the MCU connection module comprises a DC/DC power supply module and an MCU. The utility model realizes the real dormancy, reduces the power consumption of the battery management system, realizes the awakening of deep dormancy by the optical coupling switch and the design of a resistor and a capacitor, reduces the system cost and the product volume, and solves the problem that the original dormancy and awakening adopt foreign special chips.

Description

Dormancy awakening circuit based on optical coupling switch

Technical Field

The utility model relates to the technical field of wake-up circuits, in particular to a sleep wake-up circuit based on an optical coupling switch.

Background

At present, energy storage is applied to a household and a microgrid off-grid system particularly, the requirement on the power consumption of the system is strict, particularly, in the off-grid system, a sleep function is generally needed for an energy storage battery management system, the sleep function can be basically realized, but deep sleep of the system is difficult to realize, namely, a user can only be in a low-power-consumption state when the user does not use or does not communicate for a period of time, so that the power consumption of the battery management system is reduced, but the power consumption is limited, the power supply of an MCU and other peripheral circuits of the board in the low-power-consumption state still exists, the power consumption still exists, the overdischarge and power consumption of the system still exist, and the system cannot be used after a long time.

At present, a conventional external circuit cannot realize a wake-up function, only an expensive integrated chip is provided, and the conventional external circuit cannot be accepted by household products with higher requirements on cost.

SUMMERY OF THE UTILITY MODEL

In view of the defects of the background art, the utility model relates to a dormancy awakening circuit based on an optical coupling switch, and according to the problems, the awakening circuit of the cell management system unit part for managing the cell in the system is designed, key data such as the cell group monomer voltage, the temperature state, the photovoltaic charging current, the negative load electricity utilization current, the current electricity quantity of the cell group and the like are monitored in real time, particularly in the application of a photovoltaic system without a power grid, the photovoltaic panel cannot generate electricity on a cloudy day or a rainy day, the cell system with more load electricity utilization is in a voltage or feed state at the moment, the system is required to enter a low power consumption state, namely a dormancy state, the traditional dormancy is a shallow dormancy, the MCU is always in a moment detection state, the power consumption is in a mA level, in order to ensure that the cell system cannot cause serious feed due to the power consumption of the cell management system, and the requirement on the dormancy power consumption is in a microampere level, namely, the optical coupling switch activates the sleep circuit to wake up the battery management system after entering the deep sleep state.

The utility model relates to a dormancy awakening circuit based on an optical coupling switch, which comprises a CAN signal input module, an optical coupling conduction module, an MOS (metal oxide semiconductor) tube control module and an MCU (microprogrammed control Unit) connection module, wherein the CAN signal input module comprises CANH/CANL for CAN communication and a first resistor playing a role in current limiting, the optical coupling conduction module comprises the optical coupling switch, the MOS tube control module comprises a first capacitor for storage, a second capacitor for filtering, a first MOS tube, a second resistor and a fourth resistor for awakening response time of the control circuit and a third resistor for voltage division, and the MCU connection module comprises a DC/DC power supply module and an MCU.

Further, the CAN signal input module detects an external CANH/CANL signal and feeds back a signal input state to a next module.

Further, when receiving the signal that CAN signal input module fed back, opto-coupler switch switches on and charges for first electric capacity, solves the inconsistent problem of both ends electric potential, adds first resistance at the front end simultaneously and ensures to export high-low level safety.

Further, the reasonable pulse number is determined by calculating the second resistor, the fourth resistor and the first capacitor to match, the first capacitor is fully filled, and the fully filled first capacitor supplies power to the second MOS transistor.

Further, the DC/DC power supply module supplies power through VCC and supplies power to the MCU.

Furthermore, when the CAN signal input module has data communication, the problem of inconsistent electric potentials at two ends is solved by a pulse type high level through an optical coupler switch, meanwhile, a first resistor with a current limiting function is added at the front end to ensure that the output high level and the output low level are within a safety range, at the moment, a first capacitor at the front end of a first MOS (metal oxide semiconductor) tube is charged, the first MOS tube cannot be conducted due to the fact that one pulse signal is too short in time, and the capacitor is fully charged by means of system calculation and matching of a peripheral second resistor, a peripheral fourth resistor and a first capacitance value to determine the pulse quantity.

Furthermore, when the first capacitor is fully charged, enough electric quantity is provided for the conduction of the first MOS tube, the second MOS tube is conducted after the first MOS tube is conducted, the DC/DC power supply module of the power supply part of the MCU of the system is started after the second MOS tube is conducted, the system is awakened at the moment, and the MCU is supported by another MCU power supply circuit to supply power after the system is awakened.

By adopting the scheme, the dormancy in the true sense is realized, the power consumption of the battery management system is reduced, the awakening of deep dormancy is realized through the optical coupling switch, the resistor and the capacitor, the system cost is reduced, the product volume is reduced, and the problems that the original dormancy and the awakening adopt foreign special chips are solved.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic diagram of a wake-up circuit according to an embodiment of the present invention.

Reference numeral, 1, a CAN signal input module; 11. a first resistor; 2. the optical coupling conduction module; 21. an optocoupler switch; 3. the MOS tube control module; 31. a first capacitor; 32. a first MOS transistor; 33. a second MOS transistor; 34. a second resistor; 35. a third resistor; 36. a fourth resistor; 37. a second capacitor; 4. the MCU is connected with the module; 41. MCU; 42. and the DC/DC power supply module.

Detailed Description

While the embodiments of the present invention will be described and illustrated in detail with reference to the accompanying drawings, it is to be understood that the utility model is not limited to the specific embodiments disclosed, but is intended to cover various modifications, equivalents, and alternatives falling within the scope of the utility model as defined by the appended claims.

For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking specific embodiments as examples with reference to the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.

The embodiment 1 of the utility model is shown by referring to fig. 1, and includes a CAN signal input module 1, an optocoupler conduction module 2, an MOS control module 3, and an MCU connection module 4, where the CAN signal input module 1 includes CANH/CANL for CAN communication and a first resistor 11 playing a role in current limiting, the optocoupler conduction module 2 includes an optocoupler switch 21, and the MOS control module 3 includes a first capacitor 31 for storing, a second capacitor 37 for filtering, a first MOS transistor 32, a second MOS transistor 33, a second resistor 34 and a fourth resistor 36 for controlling wake-up response time of a circuit, and a third resistor 35 for voltage dividing. The MCU connection module 4 includes a DC/DC power supply module 42 and an MCU 41.

The specific working principle is that when the management system is in a deep sleep state, the optical coupling switch 21 and the circuit at the right end thereof are in a power-off state, the awakening mode is based on communication information of the CAN, when data messages exist, the CANH/CANL has a pulse type high level, when no communication exists, the optical coupling switch is in a low level, when data communication exists, the pulse type high level solves the problem of inconsistent potentials at two ends through the optical coupling switch, meanwhile, the current-limiting first resistor 11 is added at the front end to ensure that the output high and low levels are within a safe range, the first capacitor 31 at the front end of the first MOS tube 32 is charged, because the first MOS tube 32 cannot be conducted due to the short pulse signal time, the capacitor is fully charged through system calculation and the reasonable pulse quantity determined by the value matching of the peripheral second resistor 34, the fourth resistor 36 and the first capacitor 31, and sufficient electric quantity is provided for the conduction of the first MOS tube 32 after the capacitor is fully charged, after the first MOS transistor 32 is turned on, the second MOS transistor 33 is turned on, and after the second MOS transistor 33 is turned on, the DC/DC power supply module 42 of the power supply part for the system MCU41 is started, the system is awakened, and after the system is awakened, the MCU41 is supported by the MCU41 power supply circuit.

The working steps of the utility model are as follows:

s1: the CAN signal input module detects and detects an external signal, and when a CAN signal is input, the optocoupler switch 21 in the optocoupler conduction module 2 is conducted;

s2: after the optical coupling switch 21 is switched on, the VCC charges the first capacitor 31, and the first MOS tube 32 is switched on when the first capacitor 31 reaches over 75% of electric quantity;

s3: after the first MOS transistor 32 is turned on, the source level of the second MOS transistor 33 is pulled low, at this time, the second MOS transistor 33 is turned on, VCC supplies power to the DC/DC42 power supply module, and the DC/DC42 power supply module supplies power to the MCU 41;

s4: the MCU41 starts to start after power is supplied, at the moment, the sleep pin of the MCU41 is pulled low, the MCU41 stops sleeping, and the MCU41 finishes starting;

s5: when the MCU41 sleep control pin is released, the MCU41 enters a sleep state.

In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a based on optical coupling switch dormancy awaken circuit which characterized in that: including CAN signal input module, opto-coupler switch-on module, MOS pipe control module, MCU linking module, CAN signal input module includes CANH CANL of CAN communication, plays the first resistance of current-limiting effect, the opto-coupler switches on the module and includes the opto-coupler switch, MOS pipe control module includes the first electric capacity of saving usefulness, the second electric capacity of filtering usefulness, first MOS pipe, second MOS pipe, control circuit's the response time's of awakening up second resistance and fourth resistance, the third resistance of partial pressure effect, MCU linking module includes DC/DC power module and MCU.

2. The sleep wake-up circuit based on the optocoupler switch, according to claim 1, wherein: the CAN signal input module detects an external CANH/CANL signal and feeds back a signal input state to the next module.

3. The sleep wake-up circuit based on the optocoupler switch, according to claim 2, wherein: when receiving the signal of CAN signal input module feedback, opto-coupler switch switches on and charges for first electric capacity, solves the inconsistent problem of both ends electric potential, adds first resistance simultaneously and ensures to export high-low level safety.

4. The sleep wake-up circuit based on the optocoupler switch, according to claim 3, wherein: and determining a reasonable pulse number by calculating the matching of the second resistor, the fourth resistor and the first capacitor to fully fill the first capacitor, and supplying power to the second MOS transistor by the fully filled first capacitor.

5. The sleep wake-up circuit based on the optocoupler switch, according to claim 4, wherein: and the DC/DC power supply module supplies power through VCC and supplies power to the MCU.

6. The sleep wake-up circuit based on the optocoupler switch, according to claim 1, wherein: when the CAN signal input module has data communication, the problem of inconsistent electric potentials at two ends is solved by a pulse type high level through an optical coupling switch, meanwhile, a first resistor for limiting current is added at the front end to ensure that the output high level and the output low level are in a safety range, at the moment, a first capacitor at the front end of a first MOS (metal oxide semiconductor) tube is charged, the first MOS tube cannot be conducted due to the fact that one pulse signal is too short in time, and the capacitor is fully charged by determining the pulse quantity through system calculation and matching of a peripheral second resistor, a peripheral fourth resistor and a first capacitance value.

7. The sleep wake-up circuit based on the optocoupler switch, according to claim 6, wherein: when the first capacitor is fully charged, enough electric quantity is provided for the conduction of the first MOS tube, the first MOS tube conducts the second MOS tube, after the second MOS tube conducts, the DC/DC power supply module of the power supply part of the MCU of the system is started, the system is awakened at the moment, and after the system is awakened, the MCU is supported by another MCU power supply circuit to supply power.