CN104749941A - Control method of pointer type CDMA quartz clock - Google Patents

Abstract

The invention relates to a control method of a pointer type CDMA quartz clock, and belongs to the technical field of clock production and processing. According to the control method of the pointer type CDMA quartz clock provided by the invention, the pointer type clock is mainly subjected to timing by taking a precise satellite time provided by a CDMA mobile phone network signal which is wide in signal coverage and great in signal intensity as a standard time by virtue of a CDMA circuit module. The method does not severely require the geographic position of the quartz clock as that of a radio controlled clock. The position is random. Even if the clock is mounted in a building, the CDMA signal is also powerful, so that the defect that the radio controlled clock cannot receive weak signals or mistakenly decodes the signals is avoided effectively. Moreover, a receiving antenna is built in the quartz clock like that of a mobile phone, so that the clock is very easy to mount and suitable for various occasions such as domestic use and office. The CDMA circuit module provides the precise satellite time and the theoretical error of the provided time is nearly zero while the actual error does not exceed 5 milliseconds.

Description

A kind of pointer CDMA crystal clock control method

Technical field

A kind of pointer CDMA crystal clock control method of the present invention belongs to clock production and processing technical field, especially relates to a kind of pointer CDMA crystal clock control method.

Background technology

What market occurred can the quartz analog clock of non-maintaining class of automatic correcting time, mainly contains Local Area Network time service quartz-like clock, GPS crystal clock or electric wave crystal clock.

The technical disadvantages of Local Area Network clock is, need by 485 networks or Ethernet LAN, or the standard time of the time that the master clock server in the reception such as CAN network disparate networks sends or ntp server etc. realizes automatic correcting time, and error is larger, general within 1 second, need just lay communication interface and cable during finishing the early stage of moving in buildings user, mostly be applied to the public arenas such as office building, hospital, railway, square, be not suitable for civilian, and power consumption is large, expensive, real-time online is needed to power.Simultaneously Local Area Network clock also has following technological deficiency, and all regional clock of the first shares a connecting line and is in series, and the series connection ASCII character movement signal feedback cycle is long, and Signal transmissions time delay is obvious; It two is that series connection movement signal disturbs mutually, and power consumption is large; Therefore how the deficiencies in the prior art are overcome, and providing a kind of each movement can the method for designing of the efficient regional clock of transmission of information, power consumption of saving time, reduce fast, this remains a problem urgently to be resolved hurrily for those skilled in the art.

GPS crystal clock technology, directly or indirectly receive gps time information, its shortcoming is: set up longer exterior aerial, and does not generally receive GPS information in house and office building indoor, is unfavorable for installing and construction, is not suitable for indoor independent utility occasion; If indirectly by the wired or wireless reception gps time of network, then also will have communication interface, network interface or other equipment etc., cost is higher, also needs real-time online to power.

Electric wave crystal clock technology, Beijing standard time radio signal BPC (frequency 68.5KHz) launched by receiving China national time service center electric wave tower (Shangqiu, Henan), clock embedded micro-processor is utilized to change, control walking about of clock, make clock display time and Beijing standard time keep accurately consistent.It is powered by common batteries, and built-in aerial receives long-wave time service radio signals, decodes thus obtain standard time information in buildings to long wave radio station time signal.This technology has following shortcoming: (1) is although solve exterior aerial problem, but in China, limitation is very large, because only have a wireless long-wave time service radio station, the scope that this radio station covers is very unsound, even if the area that can cover, its signal dropped in buildings is also very faint, usually cause many times receiving the effective radio wave clock standard time, it is equipped with strict demand to residing address bit, when indoor location, consider the shielding of buildings to electric wave, the artificial hand-held crystal clock of general needs is installed after indoor moving is set foot-point, and decoding circuit is complicated, decode time is very long, inefficiency.(2) wave frequency of country variant is different, and decoding circuit is different, and coverage is different, causes the radio wave clock used in China, can not export to external use.(3) radio controlled clock signal is faint, and decoding circuit is complicated, is generally embedded in movement, makes the structure of movement very complicated.(4) in order to use radio wave clock, must buy export goal state the dedicated encrypted radio wave clock decoding chip of monopolization and circuit.Cost intensive, process is complicated, is extremely unfavorable for the development of horological industry.

Summary of the invention

When the present invention is for chasing after when solving existing regional clock school, reaction is slow, the problem that error is large, devise a kind of can fast and accurately for chasing after during clock school time control method, when chasing after during school especially to quartz analog clock.Its concrete technical scheme is: a kind of pointer CDMA crystal clock control method, it is by disposable high-energy lithium sub-battery module output voltage 3.6V, for movement drive circuit module is powered, movement drive circuit module becomes 1.5V voltage for sweeping second movement and jump second movement is powered through low-power consumption LDO chip, driving clock pointer runs, it is characterized in that described movement drive circuit module is also connected with a CDMA time service module, the time received is swept second movement and jump second movement by Single-chip Controlling by CDMA time service module, school during for controlling the zero of movement and chasing after, the zero of movement and when chasing after during school: first second hand zero, start second optocoupler and second motor, second hand is hurried up with 16HZ pulsed drive, after effective optocoupler pulse second being detected, close optocoupler second at once, after meter step M step, second, zero terminated, then start light splitting and point motor, pointer is hurried up with maximum 16HZ pulsed drive, and after effectively point optocoupler pulse being detected, continue to walk N step, close optocoupler, zero terminates.During zero, also to consider and receive invalid optocoupler pulse situation: second hand started zero second before 55 seconds, in 1 second, receive light feedback, namely think invalid feedback; When dividing zero, in 4 seconds, receive light feedback, invalid feedback when namely thinking; Meanwhile, a point zero detects that optical feedback signal will keep certain hour, could count step and continue to walk N step, end of then making zero; After zero terminates, read single-chip microcomputer self real-time time, then enter when chasing after the stage, actual during the chasing after of second hand is when waiting for that single-chip microcomputer its temporal is equal with the time indicated by second hand, startup driving pulse second; During the chasing after of minute hand, maximum with point pulsed drive of 16HZ; When single-chip microcomputer time and pointer instruction time not etc., will enter when chasing after, chase after constantly, the time indicated by pointer is greater than the real time, and in 5 minutes, then takes standby mode, after equal time arrives, then sends a point pulse, otherwise when directly chasing after.

In order to better realize technical purpose of the present invention, refinement that can be concrete further to technical scheme:

Be described CDMA time service module further, when needs start, utilize Single-chip Controlling metal-oxide-semiconductor to power for CDMA time service module; Movement drive circuit module directly controls standby clock module, section-type LCD module and CDMA module, during work, metal-oxide-semiconductor conducting, CDMA module powers up, and then carries out the operations such as reset by control CDMARST, CDMAPower to CDMA time service module, AT command set is utilized to obtain the state and current time etc. of CDMA signal, communicate with the high speed baud rate of 115200bps during the communication of CDMA time service module, after sending AT instruction, CDMA module provides the satellite time information being accurate to millisecond.

After being that described single-chip microcomputer powers on further, first single-chip microcomputer starts CDMA module, revise single-chip microcomputer self real-time clock time after acquisition time, then system was run using single-chip microcomputer its temporal as reference time, and time precision is thereafter determined by Single Chip Microcomputer (SCM) system self completely.

Be that described CDMA module only starts once every day further, after reading orthochronous or when read error number of times exceeds regulation, close CDMA module, wait for and starting next time.

Be described standby clock module further, by I2C bus and single chip communication, the standby messages such as date Hour Minute Second can be provided, when crystal clock initially powers on cold start-up, if can not correctly read the CDMA time, then read the standby time of standby clock module as the crystal clock pointer time; At every turn after CDMA reads orthochronous, calibrate with the standby time of moment to standby clock module of new time in integer second.

Be described section-type LCD further, this system supports the low-power consumption section-type LCD of 96 sections with 4 common ports simultaneously, for simultaneously digital output time and week date equal time information, and for when debugging and PC computer carry out interactive communication and show related parameter and arrange.

The invention has the advantages that (1) radio wave clock needs when installing to select the suitable position having strong signal, generally have dead angle.And the CDMA signal that CDMA crystal clock receives is powerful, installs and there is no dead angle, very arbitrarily.(2) disposable high-energy battery power 3-5 do not need change, be more suitable for engineer applied.(3) if necessary, install SIM card, CDMA crystal clock just can local information as the information such as temperature, humidity and PM25 be dealt into long-range by CDMA signal, and can realize remote monitoring, this is that radio wave clock cannot realize.(4) country at CDMA mobile phone networking can be exported to.

Accompanying drawing explanation

Fig. 1 is a kind of pointer CDMA crystal clock control method control block diagram of the present invention.

Embodiment

In order to the realization side of a kind of pointer CDMA crystal clock control method of the present invention can be better described, its concrete implementation method is carried out following description (see Fig. 1):

A kind of pointer CDMA crystal clock control method machine system comprises movement drive circuit module 4, disposable high-energy lithium sub-battery module 1, CDMA time service module 2, standby clock module 3, jump second gear case 5, sweeps second gear case 6, section-type LCD module 7.

A kind of pointer CDMA crystal clock control method, it is by the sub-battery module of the disposable high-energy lithium of output voltage 3.6V, for movement drive circuit module is powered, movement drive circuit module becomes 1.5V voltage for sweeping second movement and jump second movement is powered through low-power consumption LDO chip, crystal clock pointer is driven to run, described movement drive circuit module is also connected with a CDMA time service module, the time received is swept second movement and jump second movement by Single-chip Controlling by CDMA time service module, school when controlling the zero of movement and chase after, the zero of movement and when chasing after during school: first second hand zero, start second optocoupler and second motor, second hand is hurried up with 16HZ pulsed drive, after effective optocoupler pulse second being detected, close optocoupler second at once, at meter step M(M=68) after step, second, zero terminated, then light splitting and point motor is started, pointer is hurried up with maximum 16HZ pulsed drive, after effectively point optocoupler pulse being detected, continue to walk N(N=51) step, close optocoupler, zero terminates, during zero, according to receiving invalid optocoupler pulse situation: second hand started zero second before 55 seconds, in 1 second, receiving light feedback, namely think invalid feedback, when dividing zero, in 4 seconds, receive light feedback, invalid feedback when namely thinking, meanwhile, a point zero detects that optical feedback signal will keep certain hour, could count step and continue to walk N step, end of then making zero, after zero terminates, read single-chip microcomputer self real-time time, then enter when chasing after the stage, actual during the chasing after of second hand is when waiting for that single-chip microcomputer its temporal is equal with the time indicated by second hand, startup driving pulse second, during the chasing after of minute hand, maximum with point pulsed drive of 16HZ, when single-chip microcomputer time and pointer instruction time not etc., will enter when chasing after, chase after constantly, the time indicated by pointer is greater than the real time, and in 5 minutes, then takes standby mode, after equal time arrives, then sends a point pulse, otherwise when directly chasing after.

Principle illustrates:

I, disposable high energy Leah battery module 1:

Output voltage 3.6V, directly powers for movement drive circuit module 4, and supply current moment can reach more than 1A.

II, movement drive circuit module 4:

Function is as follows:

One, this module is with MSP430F4152 single-chip microcomputer for core, and single-chip microcomputer self operating voltage can between 1.8 ~ 3.6V; Through low-power consumption LDO chip, to become 1.5V voltage be jump second gear case 5 to movement drive circuit module 4 and sweep second gear case 6 and power; Movement drive circuit module 4, when needs start CDMA, utilizes Single-chip Controlling metal-oxide-semiconductor to power for CDMA time service module 2; Movement drive circuit module 4 directly controls standby clock module 3 and section-type LCD module 7.

Two, movement drive circuit module 4 Single-chip Controlling is the control core of whole system, single-chip microcomputer is mainly in sleep pattern at ordinary times, wake up once every 15.625 milliseconds, wake the duty that rear inspection is current up, the time-division motor the need of exporting pulsed drive gear core is determined according to duty, the operations such as second motor, checked whether that button is pressed simultaneously, whether cell voltage meets the demands, enter sleep subsequently, the process of this inspection and driving is at about 0.7 millisecond, the Single Chip Microcomputer (SCM) system most of the time sleeps, during sleep, the complete machine power consumption of system all drives for the motor of movement.

Three, during single-chip microcomputer sleep, 32768Hz crystal oscillator still counts, after periodic wakeup, with the low frequency operation of 32 frequencys multiplication of 32768Hz and 1.048576MHz, so both can reduce power consumption, the operations when second hand after waking up is walked and when minute hand walks can be performed again fast.

Four, the software and hardware of crystal oscillator frequency stabilization and timing-compensation realizes, with the passive crystal oscillator of direct insertion 12.5PF common and the most stable on market, by the inner integrated capacitance of MSP430F4152 single-chip microcomputer and outside 12PF tunable capacitor, by software set single-chip microcomputer internal capacitance scope, and pass through the mode of the outside tunable capacitor of hardware adjustments, first make the frequency error of 32768HZ within 0.001HZ.Then, when system cloud gray model, every 1 hour, software compensation is carried out to the evaluated error caused due to crystal oscillator.

Five, the realization of driven wheel movement, the driving of gear case movement adopts the crystal clock motor driving chip of the binding technique of standard operating voltage 1.5V, between this chip drives pulsewidth 0.98 ~ 31.25 millisecond, CMOS technique, the minimum 1.2V of operating voltage, maximum 1.7V, standard value 1.5V, starting of oscillation voltage 1.1V, driving force between 5MA to 20MA, quiescent current 0.1UA.This chip has multiple-channel output, can drive maximum No. 3 crystal clock motors.Single-chip microcomputer is operated between 2.8 ~ 3.6V at ordinary times, and determined by the voltage of battery, single-chip microcomputer IO voltage is higher, but drives this binding module by 2 100K ohm large resistance step-down forms, can reduce resistor current consumption so as far as possible.

Six, between 2 o'clock every nights to 2: 30, be that CDMA time service module 2 is powered by metal-oxide-semiconductor, standard time, then calibration system pointer time (this time provides clock by single-chip microcomputer self crystal oscillator) and standby clock module time is read by the High Speed General asynchronous serial port of 115200 baud rates.

Seven, movement zero and when chasing after during school

First second hand zero, start second optocoupler and second motor, second hand is hurried up with 16HZ pulsed drive, after effective optocoupler pulse second being detected, closes optocoupler second at once, and after meter step M step, second, zero terminated; Then start light splitting and point motor, pointer is hurried up with maximum 16HZ pulsed drive, and after effectively point optocoupler pulse being detected, continue to walk N step, close optocoupler, zero terminates.During zero, also to consider and receive invalid optocoupler pulse situation: second hand started zero second before 55 seconds, in 1 second, receive light feedback, namely think invalid feedback.When dividing zero, in 4 seconds, receive light feedback, invalid feedback when namely thinking.Meanwhile, a point zero detects that optical feedback signal will keep certain hour, could count step and continue to walk N step, end of then making zero.

After zero terminates, read single-chip microcomputer self real-time time, then enter when chasing after the stage, actual during the chasing after of second hand is when waiting for that single-chip microcomputer its temporal is equal with the time indicated by second hand, startup driving pulse second.During the chasing after of minute hand, maximum with point pulsed drive of 16HZ.As long as not etc., will not enter single-chip microcomputer time and pointer instruction time when chasing after, chase after constantly, if the time indicated by pointer is greater than the real time, and in 5 minutes, then take standby mode, after equal time arrives, then send a point pulse, otherwise when directly chasing after.

Eight, the detection of button

Button detects once every about 93.74 milliseconds.

Nine, cell voltage and current detecting

Every 3 seconds detect once, if battery current too little cause start CDMA time system reset, then close CDMA, do not restart, now dodge every 1 minute red light, represent not by CDMA school time.In addition, if the number of times of system restart is greater than 3 times in half a minute, just thinking that battery current is too little normally can not start CDMA, but now can also CD-ROM drive motor normally run.When battery is less than 2.5V, lower lower limit is reported to the police, and every 1 minute red light quick flashing 3 times, prompting user changes battery.

Ten, Flash parameter is preserved

The parameter etc. of correcting directly is kept in single-chip microcomputer self flash, does not need to extend out memory circuit.

11, state instruction

Red light indicates: (1) red light glimmers in 1 minute, represents that battery current is little, can not start CDMA

(2) red light 1 minute quick flashing two times, represents cell voltage wretched insufficiency.

(3) start CDMA, after acquisition time failure, red light dodges three times at every turn.

Green light indicates: (1) starts CDMA at every turn, and after acquisition time success, green light dodges three times.

12, SIM card interface: install SIM card, just can make a phone call or transmission information or the note such as online, be convenient to realize remote real-time monitoring.

III, standby clock module 3

Standby clock module 3, by I2C bus and single chip communication, can provide the standby messages such as date Hour Minute Second, when crystal clock initially powers on cold start-up, if correctly can not read the CDMA time, then read the standby time of PCF8563 as the crystal clock pointer time.

At every turn after CDMA reads orthochronous, calibrate with the standby time of moment to PCF8563 of new time in integer second.

During the school of IV, CDMA module 2 with communicate

CDMA module 2, by electric control on metal-oxide-semiconductor IRF7834, during work, the conducting of IRF7834 metal-oxide-semiconductor, CDMA module powers up.Then by control CDMARST, CDMAPower etc., the operations such as reset are carried out to CDMA hardware.AT command set is utilized to obtain the state and current time etc. of CDMA signal.The CDMA chip of custom-made, communicates with the high speed baud rate of 115200bps during communication, and after sending AT instruction, CDMA module provides the satellite time information being accurate to millisecond.By measures such as software compensations, time error is almost 0 in theory, maximum 10 milliseconds of actual error.

After single-chip microcomputer powers on, first MSP430 single-chip microcomputer starts CDMA, and revise single-chip microcomputer self real-time clock time after acquisition time, then system was run using single-chip microcomputer its temporal as reference time, and time precision is thereafter determined by Single Chip Microcomputer (SCM) system self completely.

This module is in order to save electricity, and every day only starts once, 2 o'clock nights to 2: 30 between start, read after orthochronous or when read error number of times exceeds regulation, close CDMA module, wait for and starting next time.

V, jump second gear case movement 5 is identical with sweeping second both gear case movements 6 mechanism.

Jump second and sweep second gear case and respectively have 2 motors, drive respectively second hand and time minute hand, S2 as the zero feedback optocoupler of second hand, S1 as time minute hand zero feedback optocoupler.S2 and S1 can not work simultaneously, the S2 work when second hand makes zero, S1 work during minute hand zero.VIN pin is optocoupler LED current, connecting resistance R8 is used for limiting optocoupler luminotron electric current and is less than 4 milliamperes, and VOUT pin is optocoupler phototriode output current signal, and connecting resistance R9 is used for when pointer reaches return-to-zero, by the pulse current exported, be converted to the pulse voltage being greater than 2.5V.During movement zero, optocoupler works with the square-wave pulse form of 16HZ, first second hand zero, then minute hand zero.Second hand was at about 55 seconds, and optocoupler S2 is by Vout output optical pulse voltage signal.During minute hand zero, at about 51.5 points, optocoupler S1 is by Vout output optical pulse voltage signal.

The motor sweeping second and jump second movement drives:

Second, motor drove second hand stepping work, and second hand makes a move 0.375 degree." normally work " or " when chasing after " time all with 16Hz speed operation.Second, motor drove with positive negative pulse stuffing form, and drive current is less than 150UA, the pulse duration time 31.25 milliseconds.Time-division motor drives hour hands and minute hand stepping work, and minute hand makes a move 1 degree.The fastest with 16Hz speed operation time " when chasing after ", during normal operation, 10 second hands make a move.Minute motor drive 360 steps then hour hands walk 1 hour.Divide motor to drive with positive negative pulse stuffing form, electric current is less than 310 microamperes, the pulse duration time 46.875 milliseconds.

VI, section-type LCD 7

This system supports to have 4 common port (com0 simultaneously, com1, com2, com3) the low-power consumption section-type LCD of 96 sections (S0 ~ S23), for simultaneously digital output time and week date equal time information, and for when debugging and PC computer carry out interactive communication and show related parameter and arrange.

Claims (6)

1. a pointer CDMA crystal clock control method, it is by the sub-battery module of the disposable high-energy lithium of output voltage 3.6V, for movement drive circuit module is powered, movement drive circuit module becomes 1.5V voltage for sweeping second movement and jump second movement is powered through low-power consumption LDO chip, crystal clock pointer is driven to run, it is characterized in that described movement drive circuit module is also connected with a CDMA time service module, the time received is swept second movement and jump second movement by Single-chip Controlling by CDMA time service module, school when controlling the zero of movement and chase after, the zero of movement and when chasing after during school: first second hand zero, start second optocoupler and second motor, second hand is hurried up with 16HZ pulsed drive, after effective optocoupler pulse second being detected, close optocoupler second at once, after meter step M step, second, zero terminated, then start light splitting and point motor, pointer is hurried up with maximum 16HZ pulsed drive, and after effectively point optocoupler pulse being detected, continue to walk N step, close optocoupler, zero terminates, during zero, according to receiving invalid optocoupler pulse situation: second hand started zero second before 55 seconds, in 1 second, receiving light feedback, namely think invalid feedback, when dividing zero, in 4 seconds, receive light feedback, invalid feedback when namely thinking, meanwhile, a point zero detects that optical feedback signal will keep certain hour, could count step and continue to walk N step, end of then making zero, after zero terminates, read single-chip microcomputer self real-time time, then enter when chasing after the stage, actual during the chasing after of second hand is when waiting for that single-chip microcomputer its temporal is equal with the time indicated by second hand, startup driving pulse second, during the chasing after of minute hand, maximum with point pulsed drive of 16HZ, when single-chip microcomputer time and pointer instruction time not etc., will enter when chasing after, chase after constantly, the time indicated by pointer is greater than the real time, and in 5 minutes, then takes standby mode, after equal time arrives, then sends a point pulse, otherwise when directly chasing after.

2. pointer CDMA crystal clock control method according to claim 1, is characterized in that described CDMA time service module, when needs start, utilizes Single-chip Controlling metal-oxide-semiconductor to power for CDMA time service module; Movement drive circuit module directly controls standby clock module, section-type LCD module and CDMA module, during work, metal-oxide-semiconductor conducting, CDMA module powers up, and then carries out the operations such as reset by control CDMARST, CDMAPower to CDMA time service module, AT command set is utilized to obtain the state and current time etc. of CDMA signal, communicate with the high speed baud rate of 115200bps during the communication of CDMA time service module, after sending AT instruction, CDMA module provides the satellite time information being accurate to millisecond.

3. pointer CDMA crystal clock control method according to claim 1, after it is characterized in that described single-chip microcomputer powers on, first single-chip microcomputer starts CDMA module, single-chip microcomputer self real-time clock time is revised after acquisition time, then system was run using single-chip microcomputer its temporal as reference time, and time precision is thereafter determined by Single Chip Microcomputer (SCM) system self completely.

4. pointer CDMA crystal clock control method according to claim 1, is characterized in that described CDMA module only starts once every day, after reading orthochronous or when read error number of times exceeds regulation, closes CDMA module, waits for and starting next time.

5. pointer CDMA crystal clock control method according to claim 2, it is characterized in that described standby clock module, by I2C bus and single chip communication, the standby messages such as date Hour Minute Second can be provided, when crystal clock initially powers on cold start-up, if can not correctly read the CDMA time, then read the standby time of standby clock module as the crystal clock pointer time; At every turn after CDMA reads orthochronous, calibrate with the standby time of moment to standby clock module of new time in integer second.

6. pointer CDMA crystal clock control method according to claim 2, it is characterized in that described section-type LCD, this system supports the low-power consumption section-type LCD of 96 sections with 4 common ports simultaneously, for simultaneously digital output time and week date equal time information, and for when debugging and PC computer carry out interactive communication and show related parameter and arrange.