KR200322711Y1 - Time Auto correction Appratus by use Global Positioning System - Google Patents

Abstract

An object of the present invention is to provide an automatic time correction device based on GPS (Global Positioning System) universal time.

This invention makes it possible to always correct the current time with an accurate time compared to the current counting time with respect to the universal time received from the satellite by the GPS receiver.

Description

Time Auto Correction Appratus by use Global Positioning System

The present invention relates to a time automatic calibration device based on GPS (Global Positioning System) universal time, and in particular, by correcting the current time being counted by using universal time received from satellites as reference time data, The present invention relates to a time automatic calibration device based on GPS (Global Positioning System) that enables time display.

In general, when installing clocks in a large number of rooms or offices such as hotels and government offices, the clocks are placed in one place, and each room has a clock that is operated by the clock. If the clock is not accurate, the time of the entire clock will be different.

However, conventionally, high precision crystal oscillation clocks are used to increase accuracy. However, the current situation is that it is inevitable that some error occurs over time.

Accordingly, an object of the present invention is to solve the above-mentioned shortcomings and to continuously correct the current time based on the universal time received from the satellite as a reference value. Global Positioning System) To provide an automatic time correction device based on universal time.

In order to achieve the above object, a time automatic calibration apparatus according to the GPS (Global Positioning System) universal time of the present invention is installed in each room to display time. An external reference signal source for supplying data for universal time needed for time calibration; An interface for interfacing an external reference signal source and a microprocessor; A watchdog timer is used as a basic clock, and the watchdog timer is used to calibrate the current time of the watchdog timer according to a result of comparing the current time being counted by the watchdog timer with an external reference signal input through the interface. Microprocessor; And a clock drive for driving the clocks in response to a signal of the microprocessor.

The external reference signal source (source) is characterized in that it comprises a GPS (Global Positioning System) receiver, a time signal radio and a manual adjustment external adjustment terminal.

The microprocessor may further include an indicator for displaying a time display state.

In addition, the time data received from the Global Positioning System (GPS) receiver is a serial value of hours, minutes, seconds, and 1 / 1,000 seconds in order to be received and is a Greenwich mean value of longitude 0 which is 9 hours later than Korean time.

1 is a block diagram schematically showing a time automatic calibration apparatus according to the GPS (Global Positioning System) world time according to the present invention,

FIG. 2 is a flowchart for explaining FIG. 1.

* Description of the symbols for the main parts of the drawings *

120: external reference signal source 140: interface

150: Watchdog Timmer 160: Microprocessor

170: indicator 180: clock driver

190: clock)

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the time automatic calibration device by GPS universal time.

1 is a block diagram schematically showing a time automatic calibration apparatus according to the GPS (Global Positioning System) world time according to the present invention.

The time automatic calibration device 100 according to the present invention is roughly provided from an external reference signal source 120 for supplying data on universal time required for time calibration, and the external reference signal source 120. Comparative determination with the current time using the interface 140 for transmitting the signal to the microprocessor 160 and the signal for universal time transmitted from the external reference signal source 120 through the interface 140 as a reference value. To control the signal required for calibration, and to drive the clock 190 installed in each room while being controlled by the microprocessor 160 and the microprocessor 160 using the watchdog timer as a basic clock. It consists of a clock driver 180. In addition, the microprocessor 160 is provided with an indicator 170 for informing the time display state.

The external reference signal source 120 is composed of a GPS (Global Positioning System) receiver 122, a time signal radio 126, and a manual adjustment external adjustment terminal 124 for receiving the universal time provided from the satellite, the GPS (Global Positioning System) A signal input from the receiver 122, the time signal radio 126, and the manual adjustment external adjustment terminal 124 is transmitted to the microprocessor 160 through the interface 140.

The microprocessor 160 outputs the time data generated by the watchdog timer 150 as a control signal before the time data received from the GPS receiver 122 is transmitted. The watchmakers 180 drive the watchmakers 190 in each room.

The GPS receiver 122 receives the universal time provided by the satellite and transmits the universal time to the microprocessor 160 through the interface 140. The time data of the satellite received by the GPS receiver 122 receives hhmmss, ie, serial signals in the order of hours, minutes, seconds and 1 / 1,000 seconds, and is Greenwich of hardness 0 which is 9 hours later than Korean time. Average.

Therefore, when the universal time received from the satellite by the GPS receiver 122 is input to the microprocessor 160 through the interface 140, the microprocessor 160 adds 9 hours to the watchdog timer. Timmer) and compares the current time with the current counting time. If the current time counted by the watchdog timer 150 coincides with the universal time received by the GPS receiver 122, the microprocessor 160 controls to display the current time as it is, and conversely, If the time is different from the current time, the microprocessor 160 corrects the time of the watchdog timer 150 by using universal time as the reference data, and recalls a signal for controlling the current time to match the universal time. It is transmitted to the clocks 190 in each room through the clock driver 180. At this time, the display time is displayed through the indicator 170 so that it can be checked in the central control room.

When no signal is continuously detected by the GPS receiver 122, the watch 190 is driven at a time counted by the watchdog timer 150 currently in progress, and the time signal radio is operated. When a signal indicating a time is input from 126, the detector 130 immediately detects the signal and inputs it to the microprocessor 160, and the microprocessor 160 uses the watchdog timer as a reference signal. Timmer) and compares the current time with the current counting time. If the current time counted by the watchdog timer 150 and the time input from the time signal radio 126 coincide, the microprocessor 160 controls the current time to be displayed as it is, and vice versa. If the current time is different from the current time, the microprocessor 160 corrects the time of the watchdog timer 150 by using the time of the time signal radio 126 as reference data, and displays the current time. A signal controlling to coincide with the time of 126 is transmitted to the clocks 190 in each room through the clock driver 180. Since the preliminary signal is 440 Hz and the time signal is 880 Hz, the detector radio 126 detects this frequency and provides the signal to the microprocessor 160 as a reference signal value.

The external control terminal 124 is used to adjust the time of the watchdog timer (Watchdog Timmer) 150 to be described later, for example, it is necessary to adjust the time of the watchdog timer (Watchdog Timmer 150) In this case, the external adjustment terminal 124 may be adjusted. When the external adjustment terminal 124 is directly manipulated by a person and adjusted to a desired time zone, the external signal adjusted at this time may be controlled by the interface 140 and the microprocessor 160. The watchdog timer is transmitted to the watchdog timer 150 and adjusted to a desired time, and the time adjusted is displayed through the indicator 170 so as to know. The external adjustment terminal 124 is separately operated regardless of the leading edge of the GPS receiver 122 and the time signal radio 126.

Priority among the GPS receiver 122, the time signal radio 126, and the external control terminal 124 constituting the external reference signal source 120 is the external control terminal 124, GPS receiver 122, time signal Radio 126 and Watchdog Timmer 150.

FIG. 2 is a flowchart for explaining FIG. 1 and will be described with reference to FIG. 1.

It is determined whether the time is output from the GPS receiver 122 to the microprocessor 160 with the start 200 (201). When universal time is input from the GPS receiver 122, the microprocessor 160 is input. Sets the universal time input from the GPS receiver 122 as the reference time (202), and the microprocessor 160 corrects the time of the watchdog timer (150) to the reference time of the universal time. (203).

If it is not possible to determine whether the time is output from the GPS receiver 122 to the microprocessor 160, the microprocessor 160 sets the time signal detected by the time signal radio 126 as a reference time. In operation 208, the time signal of the watch dog timer 150 is corrected to the reference time by the time signal input from the time signal radio 126.

When there is a universal time input from the GPS receiver 122, the microprocessor 160 inputs the reference time, and if the reference time is input from the time signal radio 126 due to an error of the GPS receiver 122, If there is, the reference time of the time signal radio 126 is compared to determine whether or not the current time counted by the watchdog timer 150 matches (204).

If a signal that is determined to match from the microprocessor 160 is triggered, the microprocessor 160 determines whether there is an external adjustment signal from the external adjustment terminal 124 (205), and if the external When it is confirmed that the external adjustment signal is input from the adjustment terminal 124, the microprocessor 160 controls the output of the signal input from the external adjustment terminal 124 to output a time corresponding thereto ( 207). However, when it is determined in step 205 that there is no external adjustment signal from the external adjustment terminal 124, the microprocessor 160 controls to output the current time counted by the watchdog timer 150. By this flow, the correct time is always displayed.

As described above, according to the present invention, by employing a simple configuration such as a GPS receiver and a microprocessor in place of the conventional expensive crystal oscillator, the current time of the magnetic field disposed in each room is corrected by the GPS universal time. It has the effect of automatically calibrating and making it appear.

Claims (4)

In the room clock which is installed in each room to display time, An external reference signal source for supplying data for universal time required for time calibration; An interface for interfacing an external reference signal source and a microprocessor; A watchdog timer is used as a basic clock, and the watchdog timer is used to calibrate the current time of the watchdog timer according to a result of comparing the current time being counted by the watchdog timer with an external reference signal input through the interface. Microprocessor; And And a clock clock drive for driving the clocks in response to a signal of the microprocessor. 2. The apparatus of claim 1, wherein the external reference signal source includes a GPS (Global Positioning System) receiver, a time signal radio, and an external adjustment terminal for manual adjustment. The apparatus of claim 1, wherein the microprocessor further comprises an indicator for displaying a time display state. According to claim 1 or 2, wherein the time data received from the GPS (Global Positioning System) receiver receives a serial signal in the order of hours, minutes, seconds and 1 / 1,000 seconds, the hardness 0 is 9 hours later than the Korean time Automatic time correction by GPS, characterized by the Greenwich mean value.