CN103472713A - Time correction system of clock - Google Patents

Abstract

A clock time correction system, characterized in that it includes: a starting module for starting the correction system; a clock module for providing current clock information when starting the correction system; a user interface for the user to obtain from the clock module The current clock information is compared with the determined information of the reference clock to obtain the error information of the current clock, thereby determining the numerical parameters for clock correction; the error compensation module is connected with the user interface, and uses the correction parameters input by the user for the first time to correct The current clock information is used for correction; the time register is used to record the time information after the clock was adjusted and set last time. In the present invention, the time velocity of the clock is tested by an instrument or manually, and within a predetermined period, after the clock is corrected by inputting correction parameters once, the system will run cyclically in the subsequent period, ensuring the accuracy of the clock and reducing the cost of adjusting the clock. Times, easy to use, strong practicability.

Description

A Clock Time Correction System

technical field

The invention relates to a clock time correction system, which belongs to the field of electronic technology.

Background technique

In families and some office situations, especially the ringtones of school and get out of class, various digital clocks emerge in an endless stream, which can realize the display of year, month, day and time. Among the hardware components of these clocks, the DS1302 clock chip is currently the most used. Due to various reasons (the most important is the crystal oscillator), there is a deviation in the accuracy of the time, which requires people to readjust after a period of time. Time is more troublesome.

At present, clocks can basically be divided into two categories, one is a clock realized by a pure hardware circuit, and the other is a digital clock realized by a smart chip, but the two have one thing in common that the time reference basically uses a crystal oscillator Realization, the most commonly used is the crystal oscillator with a frequency of 32767hz. The main parameters of the crystal oscillator are: temperature frequency difference, load capacitance, resonant impedance, etc. It is very difficult for these parameters to fully meet the design requirements, so errors are inevitable. This is very inconvenient in daily life and requires frequent adjustments, especially the ringtones of the school when classes are in and out of class. If it is inaccurate, it will cause some confusion. Therefore, a clock with higher accuracy is very necessary.

At present, the most commonly used time accuracy adjustment methods are: one is to use a very high-precision crystal oscillator (but it still cannot solve the error phenomenon), the other is to adjust the capacitance of the bypass capacitor of the crystal oscillator, and the adjusted time accuracy will be lower. It is greatly improved, but there will still be time errors. According to statistical experience, the general clock error is: every 4 hours, the difference is 1 second (fast or slow by 1 second), and what is worse is that it becomes faster or slower by a few seconds in 1 hour, so that people always It is necessary to correct the clock after a period of time. Of course, some smart devices, such as mobile phones, can automatically adjust the time service according to the national standard, but it cannot be realized for ordinary clocks.

Contents of the invention

The main purpose of the present invention is to provide a time correction system for clocks, which can automatically and cyclically perform time adjustments for digital clocks without manual frequent adjustments, and is easy to use and highly practical.

In order to achieve the above object, the present invention adopts the following technical scheme: a time correction system of a clock, characterized in that: comprising:

A start module, used to start the correction system;

A clock module, used to provide current clock information when starting the correction system;

The user interface is used for the user to obtain the current clock information from the clock module, and compare it with the determined information of the reference clock to obtain the error information of the current clock, thereby determining the numerical parameters for clock correction;

The error compensation module is connected with the user interface, and uses the correction parameters input by the user for the first time to correct the current clock information;

The time register is used to record the time information after the clock is adjusted and set last time.

Preferably, the system further includes a reference clock module for providing accurate clock information.

Preferably, the activation module is activated cyclically after the calibration period is determined.

Preferably, the numerical parameters of the clock correction include error unit, error value and correction period.

The beneficial effects of the present invention are: the present invention detects the time error of the clock according to the instrument or manual test, and after inputting the correction parameters once to calibrate the clock, the system will run cyclically in the subsequent cycle, ensuring the accuracy of the clock and reducing the number of clock adjustments , easy to use and strong practicability.

Description of drawings

Fig. 1 is a schematic block diagram of the structure of an embodiment of the present invention.

The descriptions of the marks in Fig. 1 are as follows: 1 - start module, 2 - clock module, 3 - user interface, 4 - error compensation module, 5 - time register, 6 - reference clock module.

Fig. 2 is a flowchart of the working principle of the embodiment of the present invention.

Detailed ways

The realization, functional characteristics and beneficial effects of the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention .

The time correction system of the clock in the embodiment of the present invention includes:

The startup module 1 is used to start the calibration system, and the startup module 1 is activated cyclically after the calibration period is determined;

Clock module 2, used to provide current clock information when starting the correction system;

The user interface 3 is used for the user to obtain the current clock information from the clock module 2, and compare it with the determined information of the reference clock module 6 to obtain the error information of the current clock, thereby determining the numerical parameters for clock correction, including the error unit, error value and calibration period;

The error compensation module 4 is connected with the user interface 3, and uses the correction parameters input by the user to correct the current clock information;

The time register 5 is used to record the time information after the clock was adjusted and set last time.

The system also includes a reference clock module 6 for providing accurate clock information.

The working principle of the embodiment of the present invention is as follows:

1. The entry parameter (formal parameter) of the module

To realize the error adjustment of the clock, the error size of the clock must be known first. When using the national standard, it can be monitored automatically without manual participation, and other time errors need to be manually input. There are three correction parameters in the present invention: one is the time adjustment time width (that is, after how long it can be adjusted, the unit is minutes), the second parameter is the addition and subtraction mark (that is, increase or decrease), and the third is the adjustment time ( in seconds). Example: If the clock is 1 second faster within 3 hours, one parameter is 180, the second is plus, and the third is 1.

To obtain the calibration parameters, the system defines three static variables. Under the HMI interface, enter the system clock calibration state (this program should be reserved when designing the HMI), and input these parameters.

2. Calibration

The embodiment of the present invention adopts the centralized compensation algorithm, for example: if the time adjustment time width is 3 hours, then the cycle period is 3 hours, and the system automatically performs error compensation every 3 hours, and modifies the second time register 5 of the DS1302.

In addition, if the time register 5 is used to implement power-off protection, the system will automatically memorize the parameters after power-off.

Claims (4)

1. A time correction system of a clock, characterized in that: comprising: A start module, used to start the correction system; A clock module, used to provide current clock information when starting the correction system; The user interface is used for the user to obtain the current clock information from the clock module, and compare it with the determined information of the reference clock to obtain the error information of the current clock, thereby determining the numerical parameters for clock correction; The error compensation module is connected with the user interface, and uses the correction parameters input by the user for the first time to correct the current clock information; The time register is used to record the time information after the clock was adjusted and set last time. 2. The clock time correction system according to claim 1, characterized in that: said system further comprises a reference clock module for providing accurate clock information. 3. The clock time correction system according to claim 1, characterized in that: after the correction cycle is determined, the start-up module is activated cyclically. 4. The clock time correction system according to claim 1, characterized in that: said numerical parameters of clock correction include error unit, error value and correction period.

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