CN113189499A

CN113189499A - Battery low-power processing algorithm

Info

Publication number: CN113189499A
Application number: CN202110247115.0A
Authority: CN
Inventors: 柯浩伟; 杨文静; 郭俊峰
Original assignee: Shenzhen Elink Smart Co Ltd
Current assignee: Shenzhen Elink Smart Co Ltd
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2021-07-30

Abstract

The invention provides a battery low-power processing algorithm, which comprises the following steps of S1: starting; initializing a system; s2: the ADC collects voltage; if the acquired voltage value is greater than 3.3V, the normal working state is determined, and the device enters the dormancy state; if not, confirming the state of low electric quantity, and entering dormancy; s3: awakening; collecting voltage by adopting an ADC (analog to digital converter); if the acquired voltage value is not more than 3.3V, the sleep is directly entered again; if the acquired voltage value is greater than 3.3V and not greater than 3.4V, the intermediate state is determined; s4: if the voltage is larger than 3.4V, the ADC is used for collecting the voltage again, the specific processing mode effectively avoids frequent awakening and starting up caused by voltage fluctuation, the trigger frequency of low electric quantity is reduced, the power consumption of the whole machine is reduced, and the standby time of the equipment is prolonged.

Description

Battery low-power processing algorithm

[ technical field ]

The invention relates to the technical field of battery low-power processing algorithms, in particular to a battery low-power processing algorithm with a prominent application effect.

[ background art ]

Products powered by lithium batteries often need to detect the battery capacity condition, and based on the consideration of cost reduction, the lithium battery voltage is mostly detected by using an ADC (analog to digital converter) built in an MCU (microprogrammed control unit) and then converted into the capacity, rather than adopting an additional coulometer chip.

Because the current of the equipment is in a dynamic change state in the working process, the voltage at two ends of the battery can fluctuate up and down, the voltage of the equipment in the sleep state and the wake-up state is different, and the voltage fluctuation is more frequent particularly when the battery is in a low-power critical state.

A common low power determination algorithm is to set a threshold, for example, 3.3V, and when the battery voltage is lower than the threshold, the battery is determined to be low, and the device will sound an audible and visual alarm or display the alarm through a display interface. Due to the fact that the voltage of the battery fluctuates, low power is triggered frequently, and power consumption is increased when the device is awakened frequently. Even if various software filtering algorithms are employed such as: mean filtering, median filtering still does not effectively improve the problem.

[ summary of the invention ]

In order to overcome the problems in the prior art, the invention provides a battery low-power processing algorithm with outstanding application effect.

The invention provides a low battery handling algorithm, which comprises the following steps,

s1: starting; initializing a system;

s2: the ADC collects voltage; if the acquired voltage value is greater than 3.3V, the normal working state is determined, and the device enters the dormancy state; if not, confirming the state of low electric quantity, and entering dormancy;

s3: awakening; collecting voltage by adopting an ADC (analog to digital converter); if the acquired voltage value is not more than 3.3V, the sleep is directly entered again; if the acquired voltage value is greater than 3.3V and not greater than 3.4V, the intermediate state is determined;

s4: and if the voltage is larger than 3.4V, the voltage is collected by the ADC again.

Preferably, in the step S3, it is further determined whether the low battery state is last time; if yes, directly entering the sleep mode; if not, the normal working state is confirmed.

Compared with the prior art, the specific processing mode of the battery low-power processing algorithm effectively avoids frequent awakening and starting up caused by voltage fluctuation, reduces the trigger frequency of low power, reduces the power consumption of the whole machine, and increases the standby time of equipment.

[ description of the drawings ]

Fig. 1 is a circuit structure diagram of a conventional lithium battery power supply product.

Fig. 2 is a diagram of the algorithmic processing of the present invention.

Fig. 3 is a flow chart of an algorithm implementation of the present invention.

[ detailed description of the invention ]

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a low battery handling algorithm 1 according to the present invention includes the following steps,

s1: starting; initializing a system;

Common lithium batteries are typically polymer pouch batteries, or cylindrical 18650 lithium ion batteries. And the power is supplied to the main board through the protection board. The positive pole output of protection shield is sent to the ADC sense terminal of mainboard after through resistance bleeder circuit, and mainboard circuit is through gathering the ADC, then converts the magnitude of voltage into, and this value is battery voltage value.

The invention deals with voltage fluctuation by designing 2 threshold values, and further subdivides the voltage state of the battery into a normal state, an intermediate state and a low-power state. The algorithm processing is as shown in figure 2 of the attached drawings of the specification:

the X-axis is time t and the Y-axis is cell voltage u.

The curve chart expresses the change state of the battery voltage and is divided into A-E stages.

Stage A: the battery voltage is in a normal state, and the equipment works normally.

And (B) stage: low battery state, device sleep.

And C stage: and in the intermediate state, when the low-power state is changed into the intermediate state, the equipment is not allowed to be started.

The startup by mistake can not happen when the voltage fluctuates at the stage.

And D stage: and returning to the normal voltage state, and starting the equipment to work.

And E stage: and the intermediate state allows the equipment to be started when the normal state is changed into the intermediate state.

2 thresholds were designed:

enter Low-State threshold: 3.30V

Exit low battery state threshold: 3.40V

The algorithm implementation flow chart is shown in the attached figure 3 of the specification:

describing an algorithm:

and after power-on, initialization is executed, then the ADC collects the voltage of the battery, and if the voltage is more than 3.3V, the normal working state is entered. If the voltage is less than or equal to 3.3V, triggering low power, and then entering a sleep state.

When the device is awakened and then collects the electric quantity again, if the voltage of the battery is not more than 3.3V, the device is directly dormant. If more than 3.3V is measured in the surge state but 3.4V is not reached, an intermediate state is reached.

And checking whether the normal operation can be performed or not in the intermediate state, recovering the normal operation state if the normal voltage is reduced to the intermediate state voltage, and continuing to sleep if the normal voltage is returned to the intermediate state from the low-battery state. Therefore, the problem of frequently triggering low electric quantity when the electric vehicle is in a fluctuation state is effectively avoided.

And if the voltage is more than 3.4V after the wake-up, the normal working state is directly recovered.

Through the algorithm design, the intermediate state of 100mv is increased, voltage fluctuation is allowed, and the problems of frequently triggering low electric quantity and frequently starting up are avoided. According to the power consumption and voltage fluctuation rules of different products, the range of the intermediate state voltage can be properly adjusted so as to achieve the purpose of algorithm.

Since 2 thresholds are designed algorithmically: the low-power state threshold is entered, the low-power state threshold is exited, the three states are subdivided, frequent awakening and starting up caused by voltage fluctuation are effectively avoided, the trigger frequency of low power is reduced, the power consumption of the whole machine is reduced, and the standby time of the equipment is prolonged. And the intermediate state of 2 stages is processed, the equipment is allowed to work when the normal state enters the intermediate state, and the working time of the equipment is effectively increased.

Compared with the prior art, the specific processing mode of the battery low-power processing algorithm 1 effectively avoids frequent awakening and starting up caused by voltage fluctuation, reduces the trigger frequency of low power, reduces the power consumption of the whole machine, and increases the standby time of equipment.

The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A low battery handling algorithm, comprising: comprises the following steps of (a) carrying out,

s1: starting; initializing a system;

s4: if the voltage is larger than 3.4V, performing ADC voltage collection again;

s5: thus circulating.

2. The low battery handling algorithm of claim 1, wherein: further determining whether the last time is in a low battery state in step S3; if yes, directly entering the sleep mode; if not, the normal working state is confirmed.