A low power standby power supply circuit and control method

Abstract

The invention discloses a low-power standby power supply circuit and a control method, and relates to the technical field of circuit control; the output end of an RTC timing wake-up circuit is connected to the input end of a BMS power supply circuit, the output end of the BMS power supply circuit is connected to the input end of a single-chip control circuit, the control end of a T-Box control circuit is connected to the output end of the single-chip control circuit, the input end of the T-Box control circuit is connected to the positive pole of a power supply, the output end of the T-Box control circuit is connected to the negative pole of the power supply, and a T-Box sampling circuit and a T-Box device are connected in parallel with the T-Box control circuit; timing wake-up is realized by the RTC timing wake-up circuit, and the device can be started when needed, and remain in a standby state at other times, thereby reducing power consumption and saving energy; the single-chip control circuit can determine a working mode according to demand and perform corresponding operations, thereby realizing low power consumption while meeting the power supply demand of an external device.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit control, and in particular relates to a low-power standby power supply circuit and a control method. Background Art

[0002] During long-distance transportation of electric forklifts, it is a technical challenge to meet the needs of continuous or intermittent power supply for external devices such as T-Box, while ensuring the low-power operation of the battery management system (BMS) to minimize the consumption of power batteries.

[0003] The first mainstream low-power processing method is to put the MCU in standby mode. In standby mode, the working power consumption of the MCU and its related circuits will be greatly reduced, but it will still consume mA-level current. The advantage of this method is that the MCU can quickly respond to the power supply needs of external devices, but the disadvantage is that long-term standby mode will still cause a certain amount of power consumption, especially during the transportation process of several months, this consumption cannot be ignored.

[0004] The second method is to use a normally closed relay to achieve low power consumption. In this way, when the microcontroller and its power supply are in the off state, the battery voltage can be continuously output to the outside through the normally closed contacts of the relay. The advantage of this method is that it can still provide a stable power supply in the off state, but the disadvantage is that when the external load needs to be turned off, the microcontroller needs to be enabled, and the enabling operation of the microcontroller will cause the power supply to work, which may cause unnecessary power consumption, especially during long-term transportation. This consumption will accumulate and have a negative impact on the overall life of the battery and the performance of the forklift.

[0005] Therefore, in the prior art, there is an obvious contradiction between achieving low power consumption and meeting the power supply requirements of external devices. Although the mainstream low power consumption processing methods in the current market have achieved the purpose of energy saving to a certain extent, there are still some limitations and contradictions. Summary of the invention

[0006] The purpose of the present invention is to solve the problem and to provide a low-power standby power supply circuit and a control method.

[0007] In the first aspect of the implementation of the present invention, a low-power standby power supply circuit is first proposed, the power supply circuit includes a power supply, an RTC timing wake-up circuit, a BMS power supply circuit, a single-chip microcomputer control circuit, a T-Box control circuit, a T-Box sampling circuit and a T-Box device:

[0008] The output end of the RTC timing wake-up circuit is connected to the input end of the BMS power supply circuit, and the output end of the BMS power supply circuit is connected to the input end of the single-chip control circuit;

[0009] The RTC timing wake-up circuit regularly outputs a wake-up signal to the BMS power supply circuit, so that the power supply in the BMS power supply circuit is turned on, and the BMS power supply circuit supplies power to the single-chip microcomputer control circuit;

[0010] The control end of the T-Box control circuit is connected to the output end of the single-chip control circuit, the input end of the T-Box control circuit is connected to the positive pole of the power supply, the output end of the T-Box control circuit is connected to the negative pole of the power supply, and the T-Box sampling circuit and the T-Box device are connected in parallel with the T-Box control circuit;

[0011] The T-Box control circuit determines the circuit operation mode according to the levels output by the T-box-on pin and the T-box-off pin in the single-chip control circuit.

[0012] Optionally, the T-Box control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a Q1MOS tube, a Q2MOS tube and a voltage stabilizing circuit Z1, wherein:

[0013] One end of the resistor R1 is connected to the positive electrode of the power supply and the source end of the Q1MOS tube respectively, the other end of the resistor R1 and the gate end of the Q1MOS tube are connected to one end of the resistor R2, the other end of the resistor R2 is connected to the cathode of the voltage stabilizing circuit Z1, the reference end of the voltage stabilizing circuit Z1 is connected to the other end of the resistor R3, the drain end of the Q2MOS tube, one end of the resistor R4 and the other end of the resistor R5 respectively, the anode of the voltage stabilizing circuit Z1 is connected to the negative electrode of the power supply, one end of the resistor R3 is connected to the T-box-on pin of the single-chip microcomputer in the single-chip microcomputer control circuit, the gate end of the Q2MOS tube is connected to the T-box-off pin of the single-chip microcomputer in the single-chip microcomputer control circuit, the source end of the Q2MOS tube is connected to the negative electrode of the power supply, the other end of the resistor R4 is connected to the negative electrode of the power supply, one end of the resistor R5 is connected to the drain end of the Q1MOS tube and the input end of the T-Box device, and the output end of the T-Box device is connected to the negative electrode of the power supply.

[0014] Optionally, the T-Box sampling circuit includes a resistor R6 and a resistor R7, wherein:

[0015] One end of the resistor R6 is connected to the input end of the T-Box device, the other end of the resistor R6 is respectively connected to the ADC pin of the single-chip microcomputer in the single-chip microcomputer control circuit and one end of the resistor R7, and the other end of the resistor R7 is connected to the negative electrode of the power supply.

[0016] In a second aspect of the present invention, a low-power standby power supply control method is proposed, and the method is applied to the single-chip microcomputer:

[0017] After the BMS power supply circuit supplies power to the single-chip microcomputer control circuit, the single-chip microcomputer is turned on;

[0018] The single chip microcomputer obtains a working signal before startup, and if the working signal is different from a target working signal, determines a working mode according to the target working signal; the working mode includes a startup mode and a shutdown mode;

[0019] After the single chip microcomputer performs the operation according to the working mode, the BMS power supply circuit cuts off the power supply to the single chip microcomputer control circuit.

[0020] Optionally, the startup mode includes:

[0021] When the target working signal is {1,0}, the T-box-on pin output of the single-chip microcomputer is set to a high level, and the T-box-off pin output of the single-chip microcomputer is set to a low level. At this time, the T-Box device is in the startup mode.

[0022] Optionally, the shutdown mode includes:

[0023] When the target working signal is {0,1}, the T-box-on pin output of the single-chip microcomputer is set to a low level, and the T-box-off pin output of the single-chip microcomputer is set to a high level. At this time, the T-box device is in shutdown mode.

[0024] Optionally, the method further includes:

[0025] The target sampling voltage is obtained by performing voltage division sampling by the resistor R6 and the resistor R7, and the target sampling voltage is input into the single chip microcomputer through the ADC pin of the single chip microcomputer;

[0026] The single chip microcomputer reads the target sampling voltage and compares it with the voltage at BAT+. If the ratio of the target sampling voltage to the voltage at BAT+ is not within a preset range, an alarm is triggered to notify the staff and the T-box device is adjusted to be in shutdown mode.

[0027] Optionally, the method further includes:

[0028] The number of times the BMS power supply circuit is turned on within a preset number of target cycles is obtained and recorded as first data; the target cycle is the same as the wake-up cycle of the RTC timing wake-up circuit;

[0029] Obtaining the number of wake-up times of the RTC timing wake-up circuit within a preset number of target cycles and recording it as second data;

[0030] The number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit is modified according to the first data and the second data.

[0031] Optionally, modifying the number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit according to the first data and the second data includes:

[0032] By formula Determine the number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit;

[0033] Wherein, S is the number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit, O n W is the cumulative number of startups of the BMS power supply circuit in the first n target cycles, n is the number of wake-up times of the RTC timing wake-up circuit within the first n target cycles.

[0034] Beneficial effects of the present invention:

[0035] The invention proposes a low-power standby power supply circuit, which comprises a power supply, an RTC timing wake-up circuit, a BMS power supply circuit, a single-chip microcomputer control circuit, a T-Box control circuit, a T-Box sampling circuit and a T-Box device: an output end of the RTC timing wake-up circuit is connected to an input end of the BMS power supply circuit, and an output end of the BMS power supply circuit is connected to an input end of the single-chip microcomputer control circuit; the RTC timing wake-up circuit outputs a wake-up signal to the BMS power supply circuit at a fixed time, so that a power supply in the BMS power supply circuit is turned on, and the BMS power supply circuit supplies power to the single-chip microcomputer control circuit; a control end of the T-Box control circuit is connected to an output end of the single-chip microcomputer control circuit, an input end of the T-Box control circuit is connected to a positive electrode of a power supply, an output end of the T-Box control circuit is connected to a negative electrode of a power supply, and a T-Box sampling circuit and a T-Box device are connected in parallel with the T-Box control circuit; and the T-Box control circuit determines a working mode of the circuit according to levels output by a T-box-on pin and a T-box-off pin in the single-chip microcomputer control circuit. By implementing timed wake-up through the RTC timed wake-up circuit, the device can be started when needed and remain in standby mode at other times, thereby reducing power consumption and saving energy. The single-chip control circuit can determine the working mode according to demand and perform corresponding operations. Before the BMS enters low-power operation, the external load output that needs to work is configured to be on or off. When configured to be on, the BMS is shut down and this output remains valid; when configured to be off, the BMS is shut down, and this output is synchronously closed after shutdown. In addition, the function of controllable configuration of the T-Box power supply pin through timed wake-up can greatly reduce the low-power occasions where the BMS needs to output to the outside after shutdown, achieving low power consumption while meeting the power supply requirements of external devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] Figure 1 A framework diagram of a low-power standby power supply circuit is provided for an embodiment of the present invention;

[0038] Figure 2 A circuit diagram of a low-power standby power supply circuit is provided for an embodiment of the present invention;

[0039] Figure 3 A flow chart of a low-power standby power supply control method is provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the present invention, the description of "first", "second", etc. is only used for descriptive purposes, and cannot be understood as indicating or implying its relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0042] The embodiment of the present invention provides a low-power standby power supply circuit. Figure 1 , Figure 1 A framework diagram of a low-power standby power supply circuit provided by an embodiment of the present invention. The power supply circuit includes a power supply, an RTC timer wake-up circuit, a BMS power supply circuit, a single-chip microcomputer control circuit, a T-Box control circuit, a T-Box sampling circuit and a T-Box device:

[0043] The output end of the RTC timing wake-up circuit is connected to the input end of the BMS power supply circuit, and the output end of the BMS power supply circuit is connected to the input end of the single-chip control circuit;

[0044] The RTC timing wake-up circuit regularly outputs a wake-up signal to the BMS power supply circuit, so that the power supply in the BMS power supply circuit is turned on, and the BMS power supply circuit supplies power to the single-chip microcomputer control circuit;

[0045] The control end of the T-Box control circuit is connected to the output end of the single-chip control circuit, the input end of the T-Box control circuit is connected to the positive electrode of the power supply, the output end of the T-Box control circuit is connected to the negative electrode of the power supply, and the T-Box sampling circuit and the T-Box device are connected in parallel with the T-Box control circuit;

[0046] The T-Box control circuit determines the circuit's operating mode according to the levels output by the T-box-on pin and the T-box-off pin in the single-chip control circuit.

[0047] Based on a low-power standby power supply circuit provided by an embodiment of the present invention, timed wake-up is achieved through an RTC timed wake-up circuit, so that the device can be started when needed and remain in standby state at other times, thereby reducing power consumption and saving energy. The single-chip microcomputer control circuit can determine the working mode according to the needs and perform corresponding operations. Before the BMS enters the low-power operation, the output of the external load that needs to work is configured to be on or off. When configured to be on, the BMS is shut down, and this output is continuously valid; when configured to be off, the BMS is shut down, and this output is synchronously closed after shutdown. In addition, the function of controllably configuring the power supply pin of the T-Box through timed wake-up can greatly reduce the low-power occasions where the BMS needs to output to the outside after shutdown, thereby achieving low power consumption while meeting the power supply requirements of external devices.

[0048] In one implementation, the RTC timing wake-up circuit and the BMS power supply circuit work together to start the power supply when the external device needs power, and maintain a low-power standby state at other times, effectively saving energy.

[0049] In one implementation, the T-Box device can be a communication module, sensor and interface, external interface, etc. on a forklift. The communication module includes a cellular module for sending and receiving data through a mobile network (2G / 3G / 4G / 5G); a satellite positioning module (GPS / GLONASS, etc.) for real-time positioning of the forklift; a wireless communication module, which may include a Bluetooth, Wi-Fi or radio frequency (RF) module, for communicating with the forklift's internal system or other devices. Sensors and interfaces, including a CAN bus interface, are used to communicate with the forklift's controller area network (CAN) to collect vehicle status information; analog and digital inputs are used to connect various sensors such as temperature, pressure, speed, etc.; output relays are used to control certain functions on the forklift, such as lights, buzzers or other alarm systems. Micro external interfaces include user interfaces, such as LED indicators, buttons or displays, for providing device status information and user interaction; and maintenance interfaces are used for device configuration, debugging and maintenance.

[0050] In one implementation, the connection and coordination between the T-Box control circuit and the single-chip microcomputer control circuit enables the system to determine the working mode according to the specific situation, realize fine control of the circuit, and improve the intelligence level of the system.

[0051] In one implementation, by controlling the T-Box device, the device can be protected from overload or other potential risks based on the signal output by the microcontroller, thereby extending the service life of the device.

[0052] In one embodiment, see Figure 2 , Figure 2 A circuit diagram of a low-power standby power supply circuit provided by an embodiment of the present invention, the T-Box control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a Q1MOS tube, a Q2MOS tube and a voltage stabilizing circuit Z1, wherein:

[0053] One end of the resistor R1 is connected to the positive electrode of the power supply and the source end of the Q1MOS tube respectively, the other end of the resistor R1 and the gate end of the Q1MOS tube are connected to one end of the resistor R2, the other end of the resistor R2 is connected to the cathode of the voltage stabilizing circuit Z1, the reference end of the voltage stabilizing circuit Z1 is connected to the other end of the resistor R3, the drain end of the Q2MOS tube, one end of the resistor R4 and the other end of the resistor R5 respectively, the anode of the voltage stabilizing circuit Z1 is connected to the negative electrode of the power supply, one end of the resistor R3 is connected to the T-box-on pin of the single-chip microcomputer in the single-chip microcomputer control circuit, the gate end of the Q2MOS tube is connected to the T-box-off pin of the single-chip microcomputer in the single-chip microcomputer control circuit, the source end of the Q2MOS tube is connected to the negative electrode of the power supply, the other end of the resistor R4 is connected to the negative electrode of the power supply, one end of the resistor R5 is connected to the drain end of the Q1MOS tube and the input end of the T-Box device, and the output end of the T-Box device is connected to the negative electrode of the power supply.

[0054] In one implementation, through the control of the Q1MOS tube, the switch state of the T-Box device can be controlled according to the T-box-on signal sent by the microcontroller, thereby achieving flexible control of the device.

[0055] In one implementation, the reference end of the voltage stabilizing circuit Z1 is connected to a plurality of components, which can play a protective role when the circuit is abnormal, thereby preventing overvoltage or overcurrent from damaging key components.

[0056] In one implementation, by connecting the resistor R3 and the Q2MOS tube, signal transmission between the microcontroller control circuit and the T-Box control circuit can be achieved, ensuring accurate transmission of control instructions.

[0057] In one implementation, see Figure 2 , G of Q1MOS tube and Q2MOS tube is gate, S is source, and D is drain; 1 of voltage regulator circuit Z1 is cathode, 2 is reference end, and 3 is anode.

[0058] In one embodiment, see Figure 2 , the T-Box sampling circuit includes resistors R6 and R7, where:

[0059] One end of the resistor R6 is connected to the input end of the T-Box device, the other end of the resistor R6 is respectively connected to the ADC pin of the single-chip microcomputer in the single-chip microcomputer control circuit and one end of the resistor R7, and the other end of the resistor R7 is connected to the negative electrode of the power supply.

[0060] In one implementation, the sampled data can be directly transmitted to the microcontroller for processing by connecting the ADC pin to the microcontroller, thereby achieving real-time monitoring and control of the input signal of the T-Box device.

[0061] Based on the same inventive concept, the embodiment of the present invention also provides a low-power standby power supply control method. Figure 3 , Figure 3 A flowchart of a low-power standby power supply control method provided by an embodiment of the present invention, the method is applied to a single-chip microcomputer:

[0062] S301, after the BMS power supply circuit supplies power to the single-chip microcomputer control circuit, the single-chip microcomputer is turned on.

[0063] S302, the single chip microcomputer obtains the working signal before startup, and if the working signal is different from the target working signal, determines the working mode according to the target working signal.

[0064] S303, after the single-chip microcomputer performs the operation according to the working mode, the BMS power supply circuit disconnects the power supply to the single-chip microcomputer control circuit.

[0065] The working mode includes a startup mode and a shutdown mode.

[0066] Based on a low-power standby power supply control method provided by an embodiment of the present invention, timed wake-up is achieved through an RTC timed wake-up circuit, so that the device can be started when needed and remain in standby state at other times, thereby reducing power consumption and saving energy. The single-chip microcomputer control circuit can determine the working mode according to the needs and perform corresponding operations. Before the BMS enters the low-power operation, the output of the external load that needs to work is configured to be on or off. When configured to be on, the BMS is shut down, and this output is continuously valid; when configured to be off, the BMS is shut down, and this output is synchronously closed after shutdown. In addition, the function of controllably configuring the power supply pin of the T-Box through timed wake-up can greatly reduce the low-power occasions where the BMS needs to output to the outside after shutdown, thereby achieving low power consumption while meeting the power supply requirements of external devices.

[0067] In one implementation, the power supply and power-off control of the single-chip microcomputer control circuit by the BMS power supply circuit can ensure that the system can be started and shut down normally when necessary, thereby improving the safety and reliability of the system.

[0068] In one implementation, detection and judgment are performed when the single-chip microcomputer obtains the working signal before startup, and the working mode can be determined according to actual needs, thereby avoiding unnecessary energy waste and achieving the purpose of energy saving and environmental protection.

[0069] In one implementation, after the MCU executes the operation, the BMS power supply circuit disconnects the power supply to the MCU control circuit, which can accurately control the operating status of the system, stop unnecessary power consumption in time, and improve the efficiency and stability of the system.

[0070] In one embodiment, the startup mode includes:

[0071] When the target working signal is {1,0}, the T-box-on pin output of the microcontroller is set to a high level, and the T-box-off pin output of the microcontroller is set to a low level. At this time, the T-Box device is in startup mode.

[0072] In one implementation, when the MCU controls the T-box-on pin to output a high level and the T-box-off pin to output a low level, the T-box power supply pin is turned on and the T-box can work normally. At this time, the BMS needs to shut down and enter a low power consumption mode, and the MCU and its power supply are powered off. Due to the existence of resistor R5, the Q1MOS tube continues to remain in the on state, that is, the T-box pin can maintain output at this time.

[0073] In one embodiment, the shutdown mode includes:

[0074] When the target working signal is {0,1}, the T-box-on pin output of the microcontroller is set to a low level, and the T-box-off pin output of the microcontroller is set to a high level. At this time, the T-box device is in shutdown mode.

[0075] In one implementation, when the MCU controls the T-box-on pin to output a low level and the T-box-off pin to output a high level, the T-box power supply pin is turned on and the T-box can work normally. At this time, if the BMS is turned off and enters a low power state, the MCU and its power supply are powered off. Since the T-box-on was previously configured as a low level, the Q1MOS tube has no output and the T-box is powered off.

[0076] In one embodiment, the method further comprises:

[0077] The target sampling voltage is obtained by voltage division sampling through resistors R6 and R7, and the target sampling voltage is input into the single chip microcomputer through the ADC pin of the single chip microcomputer;

[0078] The microcontroller reads the target sampling voltage and compares it with the voltage at BAT+. If the ratio of the target sampling voltage to the voltage at BAT+ is not within the preset range, an alarm is triggered to notify the staff and the T-box device is adjusted to the shutdown mode.

[0079] In one implementation, the voltage division sampling of resistors R6 and R7 is sampled by MCU-ADC and enters the ADC pin of the microcontroller. The output value read by the microcontroller can be compared with the BAT+ voltage to determine whether the output voltage value is normal, which can be used as a diagnosis of the T-box power supply, thereby realizing rapid detection of abnormal situations and timely response, ensuring the stability and safety of system operation.

[0080] In one embodiment, the method further comprises:

[0081] The number of times the BMS power supply circuit is turned on within a preset number of target cycles is obtained and recorded as first data; the target cycle is the same as the wake-up cycle of the RTC timing wake-up circuit;

[0082] Obtaining the number of wake-up times of the RTC timing wake-up circuit within a preset number of target cycles and recording it as second data;

[0083] The number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit is modified according to the first data and the second data.

[0084] In one implementation, by monitoring the power-on times and wake-up times of the BMS power supply circuit and the RTC timer wake-up circuit, the working status and energy consumption of the system can be better understood, so as to adjust the wake-up times of the RTC timer wake-up circuit in a targeted manner, thereby achieving the purpose of optimizing energy consumption management.

[0085] In one implementation, the preset number is determined by a staff member.

[0086] In one implementation, adjusting the number of wake-up times according to actual usage can reduce unnecessary system operations, thereby reducing system wear and aging speed and extending the service life of the device.

[0087] In one embodiment, modifying the number of wake-up times in a wake-up cycle of the RTC timing wake-up circuit according to the first data and the second data includes:

[0088] By formula Determine the number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit;

[0089] Wherein, S is the number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit, O n Q is the cumulative number of startups of the BMS power supply circuit in the first n target cycles, n The number of wake-up times of the RTC timing wake-up circuit within the first n target cycles.

[0090] In one implementation, based on the proportional relationship between the number of power-on times and the number of wake-up times, the utilization of system resources can be better balanced, thereby obtaining the optimal number of wake-up times for the wake-up circuit in the current target cycle.

[0091] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A low power standby power supply circuit, characterized in that: The power supply circuit includes a power supply, an RTC timer wake-up circuit, a BMS power supply circuit, a single-chip microcomputer control circuit, a T-Box control circuit, a T-Box sampling circuit and a T-Box device: The output end of the RTC timing wake-up circuit is connected to the input end of the BMS power supply circuit, and the output end of the BMS power supply circuit is connected to the input end of the single-chip control circuit; The RTC timing wake-up circuit regularly outputs a wake-up signal to the BMS power supply circuit, so that the power supply in the BMS power supply circuit is turned on, and the BMS power supply circuit supplies power to the single-chip microcomputer control circuit; The control end of the T-Box control circuit is connected to the output end of the single-chip control circuit, the input end of the T-Box control circuit is connected to the positive pole of the power supply, the output end of the T-Box control circuit is connected to the negative pole of the power supply, and the T-Box sampling circuit and the T-Box device are connected in parallel with the T-Box control circuit; The T-Box control circuit determines the circuit operation mode according to the levels output by the T-box-on pin and the T-box-off pin in the single-chip control circuit; The single-chip microcomputer control circuit workflow includes the following steps: after the BMS power supply circuit supplies power to the single-chip microcomputer control circuit, the single-chip microcomputer is turned on; The single chip microcomputer obtains a working signal before startup, and if the working signal is different from a target working signal, determines a working mode according to the target working signal; the working mode includes a startup mode and a shutdown mode; After the single chip microcomputer performs the operation according to the working mode, the BMS power supply circuit cuts off the power supply to the single chip microcomputer control circuit.

2. A low power standby power supply circuit according to claim 1, characterized in that: The T-Box control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a Q1 MOS tube, a Q2 MOS tube and a voltage stabilizing circuit Z1, wherein: One end of the resistor R1 is connected to the positive electrode of the power supply and the source end of the Q1 MOS tube respectively, the other end of the resistor R1 and the gate end of the Q1 MOS tube are connected to one end of the resistor R2, the other end of the resistor R2 is connected to the cathode of the voltage stabilizing circuit Z1, the reference end of the voltage stabilizing circuit Z1 is connected to the other end of the resistor R3, the drain end of the Q2MOS tube, one end of the resistor R4 and the other end of the resistor R5 respectively, the anode of the voltage stabilizing circuit Z1 is connected to the negative electrode of the power supply, one end of the resistor R3 is connected to the T-box-on pin of the single-chip microcomputer in the single-chip microcomputer control circuit, the gate end of the Q2MOS tube is connected to the T-box-off pin of the single-chip microcomputer in the single-chip microcomputer control circuit, the source end of the Q2MOS tube is connected to the negative electrode of the power supply, the other end of the resistor R4 is connected to the negative electrode of the power supply, one end of the resistor R5 is connected to the drain end of the Q1 MOS tube and the input end of the T-Box device, and the output end of the T-Box device is connected to the negative electrode of the power supply.

3. A low power standby power supply circuit according to claim 2, characterized in that: The T-Box sampling circuit includes a resistor R6 and a resistor R7, wherein: One end of the resistor R6 is connected to the input end of the T-Box device, the other end of the resistor R6 is respectively connected to the ADC pin of the single-chip microcomputer in the single-chip microcomputer control circuit and one end of the resistor R7, and the other end of the resistor R7 is connected to the negative electrode of the power supply.

4. A control method for a low-power standby power supply circuit, the method being applied to the low-power standby power supply circuit according to claim 3, characterized in that: The startup modes include: When the target working signal is {1,0}, the T-box-on pin output of the single-chip microcomputer is set to a high level, and the T-box-off pin output of the single-chip microcomputer is set to a low level. At this time, the T-Box device is in the startup mode.

5. The control method of a low power standby power supply circuit according to claim 4, characterized in that: The shutdown modes include: When the target working signal is {0,1}, the T-box-on pin output of the single-chip microcomputer is set to a low level, and the T-box-off pin output of the single-chip microcomputer is set to a high level. At this time, the T-box device is in shutdown mode.

6. The control method of a low power standby power supply circuit according to claim 4, characterized in that: The method further comprises: The target sampling voltage is obtained by performing voltage division sampling by the resistor R6 and the resistor R7, and the target sampling voltage is input into the single chip microcomputer through the ADC pin of the single chip microcomputer; The single chip microcomputer reads the target sampling voltage and compares it with the voltage at BAT+. If the ratio of the target sampling voltage to the voltage at BAT+ is not within a preset range, an alarm is triggered to notify the staff and the T-box device is adjusted to be in shutdown mode.

7. The control method of a low power standby power supply circuit according to claim 4, characterized in that: The method further comprises: The number of times the BMS power supply circuit is turned on within a preset number of target cycles is obtained and recorded as first data; the target cycle is the same as the wake-up cycle of the RTC timing wake-up circuit; Obtaining the number of wake-up times of the RTC timing wake-up circuit within a preset number of target cycles and recording it as second data; The number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit is modified according to the first data and the second data.

8. The control method of a low power standby power supply circuit according to claim 7, characterized in that: Modifying the number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit according to the first data and the second data includes: By formula Determine the number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit; Wherein, S is the number of wake-up times within the wake-up cycle of the RTC timing wake-up circuit, O n W is the cumulative number of startups of the BMS power supply circuit in the first n target cycles, n is the number of wake-up times of the RTC timing wake-up circuit within the first n target cycles.

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