CN109144219B - Method for realizing low-voltage protection unlocking by matching with power failure delay - Google Patents
Method for realizing low-voltage protection unlocking by matching with power failure delay Download PDFInfo
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- CN109144219B CN109144219B CN201810941613.3A CN201810941613A CN109144219B CN 109144219 B CN109144219 B CN 109144219B CN 201810941613 A CN201810941613 A CN 201810941613A CN 109144219 B CN109144219 B CN 109144219B
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- unlocking
- voltage protection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/30—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations
- G06F1/305—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations in the event of power-supply fluctuations
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/266—Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
Abstract
The invention discloses a method for realizing low-voltage protection unlocking by matching with power failure delay, wherein a system enters a low-voltage protection state: s1, detecting system voltage; s2, judging whether the current voltage is larger than the set starting voltage V1, if so, entering S4; otherwise, go to S3; s3, recording the detected system voltage as the previous voltage, and returning to S1; s4, judging whether the previous voltage is smaller than the set low-voltage protection threshold value Vt, if so, entering S5; otherwise, go to S3; s5, turning on the power supply, clearing the error flag bit to enable the system to recover to normal, and entering S1; and the steps S1-S5 are circularly operated until the system chip is completely powered off or the unlocking is successful. The invention aims at the system for unlocking protection only when the power is rapidly turned on and off again instead of the battery voltage is recovered, and realizes low-voltage protection unlocking. Under the condition of not increasing structural hardware, the invention is matched with the delay time of power failure, and the problem that the system cannot be started with probability is solved when the system is quickly turned on and turned off but the battery voltage is recovered.
Description
Technical Field
The invention relates to low-voltage protection, in particular to a method for realizing low-voltage protection unlocking by matching with power failure delay.
Background
For embedded development, because the system often adds a capacitor to prevent the jitter of the power supply end, the instability of power supply is reduced, but because of the existence of the capacitor, the system has a certain delay when the power is off. The 5V power supply single chip microcomputer is also slowly dropped to the voltage for stopping working due to the existence of the capacitor, and the software completely stops running, namely a period of time delay exists between the system power failure and the complete software stop running, which is called as the power failure delay of the software.
The system generally has a low-voltage protection function, generally protects the voltage of an access system, which is called system voltage, and the power supply voltage of the singlechip is converted from the system voltage. When the system voltage is in power failure, the software enters a low-voltage protection program, the software cannot immediately stop running due to the existence of the power failure delay of the software, and at the moment, if the system voltage is quickly recovered, the power supply of the single chip microcomputer is recovered, the software is still in a protection state and is not reset, and the system cannot run.
For the whole system, the voltage is recovered after the power failure, and the whole system is required to be operated again, but the action cannot be completed due to the existence of the power failure delay of software. Under general conditions, a voltage detection circuit is added to the power supply voltage of the single chip microcomputer and is matched with software, so that the software is reset when the voltage of the single chip microcomputer is reduced, hardware expense and software expense are increased, and cost is increased; another approach is to exit the protection if a voltage rise is detected. And after the system achieves low-voltage protection, the power supply of the system is closed, even if the power supply is recovered, the system is still not opened, and the two methods cannot meet the requirements unless the system is turned on and off again.
Disclosure of Invention
The invention aims to: the method for realizing the low-voltage protection unlocking in coordination with the power failure delay is characterized in that after low-voltage protection, a system power supply is turned off, and only when the battery is quickly turned on and off again instead of battery voltage recovery, the system power supply is unlocked, protected and recovered, and the requirements of not unlocking after the battery voltage recovery and unlocking after the battery is turned on and off again are met.
The technical scheme of the invention is as follows:
the method for realizing the low-voltage protection unlocking by matching with the power failure delay comprises the following steps that when a system enters a low-voltage protection state:
s1, detecting system voltage;
s2, judging whether the current voltage is larger than the set starting voltage V1, if so, entering S4; otherwise, go to S3;
s3, recording the detected system voltage as the previous voltage, and returning to S1;
s4, judging whether the previous voltage is smaller than the set low-voltage protection threshold value Vt, if so, entering S5, otherwise, entering S3;
s5, turning on the power supply, clearing the error flag bit to enable the system to recover to normal, and entering S1;
and the steps S1-S5 are circularly operated until the system chip is completely powered off or the unlocking is successful.
Preferably, the low-voltage protection state refers to low-voltage protection of a system power supply voltage, and the system chip voltage is obtained by conversion of a voltage stabilizing module.
Preferably, the corresponding action after the low-voltage protection is to turn off the system power supply, and the system can be turned on only when the power supply is turned on and off again even if the power supply is recovered after the system power supply is turned off.
Preferably, the power supply is a battery pack.
The invention has the advantages that:
1. the method for realizing the low-voltage protection unlocking in cooperation with the power failure delay realizes the low-voltage protection unlocking aiming at a system for unlocking protection only when the power is quickly turned on and off again instead of the battery voltage is recovered.
2. Under the condition of not increasing a power supply voltage detection circuit of a single chip microcomputer, the power failure delay time is matched, the problem that the system cannot be started with probability is solved when the system is rapidly turned on and turned off, and hardware cost is saved.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a flow chart of a method of the present invention for implementing low voltage protection unlocking in conjunction with power down delay;
FIG. 2 is a graph showing the variation of the battery voltage, the power-off signal, and the power supply of the single chip during the low-voltage protection process according to the embodiment;
fig. 3 is an enlarged view of a change curve at time T2 in fig. 2.
Detailed Description
The system is used for a blower project, the system detects the battery voltage of 40V, the single chip microcomputer is PIC16F616, and the working voltage range is 5.5V-2V. The low-voltage protection threshold value of the blower to the battery voltage is 26V, the starting condition is more than 29V, namely the system wants to start, the battery voltage must be more than 29V, if the system voltage drops below 26V and lasts 500ms in the starting stage, low-voltage protection is carried out, and the power supply is a battery pack. The corresponding action is to close the system power supply after the low-voltage protection, the system is not opened even if the power supply is recovered (the voltage self-recovery slope of the battery pack is less than 0.6V/ms) after the system power supply is closed, and the system is unlocked and opened only under the condition of re-switching on and off.
As shown in fig. 1, when the system enters a low-voltage protection state (the low-voltage protection state refers to low-voltage protection of the system power supply voltage, not the single-chip microcomputer power supply voltage, the single-chip microcomputer voltage is obtained by conversion of a voltage stabilizing chip):
s1, detecting system voltage;
s2, judging whether the current voltage is larger than the set starting voltage 29V, if so, entering S4; otherwise, go to S3;
s3, recording the detected system voltage as the previous voltage, and returning to S1;
s4, judging whether the previous voltage is smaller than a set low-voltage protection threshold value 26V, if so, entering S5, otherwise, entering S3;
s5, turning on the power supply, clearing the error flag bit to enable the system to recover to normal, and entering S1;
and the steps S1-S5 are circularly operated until the system chip is completely powered off or the unlocking is successful.
It can be seen from fig. 2 that when the voltage is lower than 26V and lasts for 500ms from t1 to t2, the system enters low-voltage protection and the system is powered off. As can be seen from the enlarged view at the time t2 in fig. 3, the voltage of the single chip microcomputer drops from 5V to below 2V within 4.8ms after the system is powered off, and if the voltage rises rapidly within this time, the function of protection unlocking is needed to restore to normal.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the invention are covered in the protection scope of the invention.
Claims (4)
1. The method for realizing the low-voltage protection unlocking by matching with the power failure delay is characterized in that when the system enters a low-voltage protection state:
s1, detecting system voltage;
s2, judging whether the current voltage is larger than the set starting voltage V1, if so, entering S4; otherwise, go to S3;
s3, recording the detected system voltage as the previous voltage, and returning to S1;
s4, judging whether the previous voltage is smaller than the set low-voltage protection threshold value Vt, if so, entering S5, otherwise, entering S3;
s5, turning on the power supply, clearing the error flag bit to enable the system to recover to normal, and entering S1;
and the steps S1-S5 are circularly operated until the system chip is completely powered off or the unlocking is successful.
2. The method for achieving low-voltage protection unlocking in cooperation with power failure delay according to claim 1 is characterized in that the low-voltage protection state refers to low-voltage protection of system power supply voltage, and system chip voltage is obtained through conversion of a voltage stabilizing module.
3. The method for achieving low-voltage protection unlocking in cooperation with power failure delay according to claim 1, wherein the corresponding action after low-voltage protection is to turn off a system power supply, and the system is not turned on even if the power supply is recovered after the system power supply is turned off.
4. The method for achieving low-voltage protection unlocking in cooperation with power failure delay according to claim 3, wherein the system power supply is a battery pack.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810941613.3A CN109144219B (en) | 2018-08-17 | 2018-08-17 | Method for realizing low-voltage protection unlocking by matching with power failure delay |
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| CN201810941613.3A CN109144219B (en) | 2018-08-17 | 2018-08-17 | Method for realizing low-voltage protection unlocking by matching with power failure delay |
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| CN109144219A CN109144219A (en) | 2019-01-04 |
| CN109144219B true CN109144219B (en) | 2021-08-27 |
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| CN116107411B (en) * | 2023-04-12 | 2023-08-29 | 荣耀终端有限公司 | Starting-up method and related device |
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2018
- 2018-08-17 CN CN201810941613.3A patent/CN109144219B/en active Active
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| US5963015A (en) * | 1997-05-21 | 1999-10-05 | Samsung Electronics Co., Ltd. | External battery charger for use with a battery powered electronic device and an extra battery |
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| CN107024657A (en) * | 2016-01-30 | 2017-08-08 | 中山乐心电子有限公司 | A kind of electricity display processing method and device for electronic equipment |
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