CN102830611B

CN102830611B - Time source

Info

Publication number: CN102830611B
Application number: CN201210325404.9A
Authority: CN
Inventors: 巫玲坚; 鲍贤勇; 曾庆宇
Original assignee: Fiyta Group Co Ltd; Shenzhen Fiyta Science and Technology Development Co Ltd
Current assignee: Feiyada Precision Technology Co., Ltd; SHENZHEN FLYTA TECHNOLOGY DEVELOPMENT Co.,Ltd.
Priority date: 2012-09-05
Filing date: 2012-09-05
Publication date: 2014-10-22
Anticipated expiration: 2032-09-05
Also published as: CN102830611A

Abstract

The invention relates to a time source. The time source comprises a clock chip module, a microcontroller and a GPS (Global Positioning System) receiver, wherein the microcontroller is respectively in communication connection with the clock chip module and the GPS receiver, the GPS receiver is used for receiving a time and position signal of a GPS, the microcontroller is used for converting the information of the time and the position of the GPS into correction MAN (Manual Time) time and correction UTC (Universal Time Coordinated) time and then sending the correction MAN time and the correction UTC time to the clock chip module for initializing and correcting, and the clock chip module is used for generating an MAN time and a UTC time according to received GPS time. By implementing the time source disclosed by the invention, the local time and the UTC time can be simultaneously recorded, an uninterruptible power supply is adopted for supplying power, a timing process is free from interference of an MCU (Microprogrammed Control Unit), and the reliability is high.

Description

A kind of time source

Technical field

The present invention relates to timing field, more particularly, relate to a kind of energy automatic correcting time, the time source of MAN time and UTC time is outwards provided.

Background technology

Modern electronic device usually needs to provide correct time information for user or other electronic component, yet when electronic device need to move, such as the aircraft clock on aircraft, mobile phone terminal etc., will relate to the problem of the time difference producing across time zone.There are some to change special times, such as adjusting the leap second of using daylight-saving time, the whole world etc., the general insurmountable problem of timing rule especially.

And existing time source utilizes inner crystal oscillator or external crystal-controlled oscillation as frequency source, accumulation timing can produce frequency drift under different working temperatures, needs irregular carrying out time calibration; On the other hand, existing time source adopts the frame mode of external crystal-controlled oscillation and internal controller, also easily produces cumulative errors.

Be badly in need of now a kind of time source that can realize automatic correcting time, to offer all kinds of electronic devices for this reason.

Summary of the invention

Problem to be solved by this invention is, for existing time source, cannot provide temporal information complicated and changeable, provide a kind of can automatic calibration when accurately walking and the time source in the time zone of can automatically switching.

Solution of the above problems of the present invention is: construct a kind of time source, comprise clock chip module, microcontroller and gps receiver, microcontroller communicates to connect with clock chip module and gps receiver respectively;

Gps receiver, for receiving time and the position signalling of GPS;

Microcontroller, for being sent to clock chip module by the gps time of reception;

Clock chip module, for generating MAN time and UTC time.

Time source of the present invention, wherein microcontroller is converted into calibration MAN time and calibration UTC time by gps time and position signalling, and calibration MAN time and calibration UTC time are sent to clock chip module, for initialization or calibration clock chip module,

Time source of the present invention, clock chip module comprises:

MAN real-time timepiece chip, receives GPS correcting delay signal or manual signalization from microcontroller, generates the MAN time;

UTC real-time timepiece chip, receives the GPS correcting delay signal from microcontroller, generates the UTC time;

Temperature compensating crystal oscillator, is connected with MAN real-time timepiece chip, UTC real-time timepiece chip, for eliminating the time error of temperature drift generation and providing original clock frequency to MAN real-time timepiece chip, UTC real-time timepiece chip.

Time source of the present invention, also comprises the external power source being connected with clock chip module.

Implement time source of the present invention, can record local zone time and UTC time simultaneously, adopt uninterrupted power source power supply, timing course is not subject to the interference of MCU, and reliability is high.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the present invention will be described, wherein:

Fig. 1 is the structural representation of time source of the present invention;

Fig. 2 is the structural representation of clock chip module of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail.

Be illustrated in figure 1 the structural representation of time source of the present invention, time source comprises microcontroller 100, clock chip module 200, gps receiver 300, and microcontroller and clock chip module 200, gps receiver 300 communicate to connect respectively.In the present embodiment, gps receiver 300 by the antenna that carries from GPS (Global Position System, GPS) system obtains time and the position signalling of GPS, and by peripheral bus, signal is transferred to microcontroller 100, by utilizing after microcontroller 100 decodings.

Microcontroller 100, at the time and the position signalling that receive from the GPS of gps receiver 300, will be decoded to it, can be used by clock chip module 200.Concrete, the gps time of 100 pairs of receptions of microcontroller is decoded, and produces calibration UTC(Universal Time Coordinated, coordinated universal time) time and calibration MAN(Manual Time, manually setup times) time; Calibration UTC time and calibration MAN time are for initialization and calibration clock chip module 200; When microcontroller 100 was asked in other the external module time of sending, read the temporal information of clock chip module 200, the corresponding time is sent by suitable port, or carry out real-time demonstration by the display unit being connected with microcontroller 100.

Be illustrated in figure 2 the preferred implementation first of clock chip module 200 of the present invention, clock chip module 200 comprises MAN real-time timepiece chip 220, UTC real-time timepiece chip 230 and temperature compensating crystal oscillator 210, MAN real-time timepiece chip 220, UTC real-time timepiece chip 230 are connected with microcontroller 100 respectively, and temperature compensating crystal oscillator 210 is connected with MAN real-time timepiece chip 220, UTC real-time timepiece chip 230.Microcontroller 100 is also connected with gps receiver 300, receives from outside gps time and positional information.

Preferably, MAN real-time timepiece chip 220, UTC real-time timepiece chip 230 pass through I ²c serial line interface is communicated by letter with microcontroller 100, accept the read-write operation of microcontroller 100, MAN real-time timepiece chip 220, UTC real-time timepiece chip 230 obtain current calibration MAN time and calibration UTC time from microcontroller 100, and this calibrating signal is that microcontroller 100 obtains the gps time from gps receiver 300 and positional information through computing; MAN real-time timepiece chip 220, UTC real-time timepiece chip 230 return to MAN time and UTC time to microcontroller 100, temperature compensating crystal oscillator 210 is as the clock source of real-time timepiece chip, organic whole while forming a redundancy, contrast, error correction, school with MAN real-time timepiece chip 220, UTC real-time timepiece chip 230 and microcontroller 100, on the one hand with crystal oscillator output frequency temperature drift under the working temperature of-45 ℃～85 ℃ of temperature be less than 1ppm(1,000,000/), guaranteed clock timing degree of stability; Read-write RTC(Real Time Clock on the other hand, real-time clock), can receive the real-time time service information of GPS by bus, when it is carried out to school, eliminate clock cumulative errors, realize the doubleclocking source timing of read-write real-time clock (RTC) unit and gps time signal, accuracy of timekeeping keeps synchronizeing with gps time.Like this when carrying out Transmeridian flight, can be by the GPS positional information receiving, calculate the time difference in time zone, the local zone time of clock display is adjusted automatically, for aircrew provides convenience, solve existing aircraft clock and when Transmeridian flight, can not automatically adjust the local zone time problem of (MAN time).

Preferably, clock chip module 200 is connected with an external power source, this power supply is uninterrupted power source independently, even if microcontroller 100 quits work or exceptional reset, 200 internal clockings of clock chip module are also unaffected, when microcontroller 100 normal work, still can provide the reliable time, guarantee clock reliable timing under Various Complex operating mode.When having external unit to utilize time signal, microcontroller 100 reads corresponding real-time timepiece chip data immediately, and sends the data to this equipment.

More than provided the displaying scheme in MAN time and UTC time, also can increase according to needs in actual applications: for example in clock chip module 200, increase regional real-time timepiece chip, for the temporal calculation result according to MAN real-time timepiece chip 220 and UTC real-time timepiece chip 230, combining position information, calculates the interested zone time of user (such as Beijing time etc.).

These are only the specific embodiment of the invention, can not limit scope of the present invention with this, equalization that those skilled in the art in the art do according to this creation changes, and the change known of those skilled in that art, all should still belong to the scope that the present invention is contained.

Claims

1. a time source, it is characterized in that, described time source comprises clock chip module (200), microcontroller (100) and gps receiver (300), and described microcontroller (100) communicates to connect with described clock chip module (200) and gps receiver (300) respectively;

Gps receiver (300), for receiving time and the position signalling of GPS;

Microcontroller (100), for being sent to the gps time of reception clock chip module (200);

Clock chip module (200), for generating MAN time and UTC time;

Described microcontroller (100) is converted into calibration MAN time and calibration UTC time by gps time and position signalling, and described calibration MAN time and calibration UTC time are sent to clock chip module (200) for initialization or calibrate described clock chip module (200);

Described clock chip module (200) comprising:

Temperature compensating crystal oscillator, is connected with MAN real-time timepiece chip, UTC real-time timepiece chip, for eliminating the time error of temperature drift generation and providing original clock frequency to MAN real-time timepiece chip, UTC real-time timepiece chip,

Described temperature compensating crystal oscillator, MAN real-time timepiece chip and UTC real-time timepiece chip read-write RTC, receive the real-time time service information of GPS by bus, when described time service information is carried out to school, eliminates clock cumulative errors.

2. time source according to claim 1, is characterized in that, described time source also comprises the power supply being connected with clock chip module (200).