JPS62103598A - Time unit system - Google Patents

Abstract

PURPOSE:To eliminate difference time counting between time units free from cutting off of power source of the time units, by supplying a power source and a clock to respective time units from a time synchronizer. CONSTITUTION:Likewise, individual time units 1, 2,...n each have a clock receiving circuit 201, an oscillation circuit 203, a clock change-over circuit 202, a time counting circuit 206, an internal power source 204, a power source preference circuit 205 and a battery-backup circuit 207. The circuit 205 which the units 1, 2,...n have outputs a power source 110 in priority when the power source 110 from the time synthesizer 101 and the power source 204 are supplied simultaneously and supplies a power to the circuits 201, 202, 206 and 203. This ensures that when the units 1, 2,...n each receive the same clock 120 in the same system, the same clock 120 is inputted as long as the power source 110 even though the power source 204 is cut off by receiving the power from a unit 101. Thus, the time counting of the time counting circuit 206 can be coincided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a timekeeping system used in an information processing device.

(Prior Art) When a plurality of time devices exist in the same system, a time synchronization device supplies the same clock to each time device in order to match the time measurements of each time device.

A conventional time device is powered only by its own built-in power source.

Therefore, if the power to the time device itself is cut off, it will no longer be able to measure time using the clock from the time synchronization device, and will instead use the clock from the oscillation circuit due to battery backup.

(Problem to be Solved by the Invention) However, the accuracy of the oscillation circuit built into each time device does not necessarily match, although it is within an allowable range, so there is a problem that there is a difference in time measurement between each time device. be. This also applies when one time device is powered on and measures time using the clock from the time synchronization device, while another time device measures time using the clock from the oscillator circuit because its power has been cut off. Problems arise.

It is an object of the present invention to solve the above-mentioned problem by supplying power and a clock from a time synchronizing device to each time device so that even if the power of the time device is cut off, the time measurements between the time devices are consistent. Our goal is to provide equipment systems.

(Means for Solving the Problems) In order to achieve the above object, the time device system according to the present invention includes a plurality of time devices, and a time device for each time device in order to synchronize the timekeeping operations of the plurality of time devices. In the time device system, each of the time devices includes an oscillation circuit that generates a clock, a clock reception circuit that receives the clock from the time synchronization device, and a clock reception circuit that receives the clock from the time synchronization device. a clock switching circuit that switches between the clock from the oscillation circuit and the clock received by the clock receiving circuit in response to an enable signal from a time synchronization device; and a clock circuit that clocks the clock output from the clock switching circuit; The power source can be selected from either the internal power source or the internal power source and the power source from the time synchronization device. When power is supplied from the time synchronization device, the power source of the time synchronization device is output and applied to each circuit. It consists of a power supply priority circuit and a battery backup circuit for back-amplifying when both the internal power supply and the power supply from the time synchronization device are cut off.

(Example) Hereinafter, the present invention will be described in further detail with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of a time device system according to the present invention.

The time device system is a time device (11(2)...(nl
and a time synchronization device 101.

Each time device has a similar configuration, and the configuration of the time device 102 will be described as a representative.

From the time synchronization device 101, the power supply 110. clock 120
．． and an enable signal 130. The time device fil 102 includes a clock receiving circuit 201 and a salt generating circuit 2.
03. Clock switching circuit 202° clock circuit 206. Internal power supply 204. It is composed of a power supply priority circuit 205 and a battery backup circuit 207.

Clock 120 sent from time synchronization device 101
is received by the clock receiving circuit 201, and its clock output 121 is input to the clock switching circuit 202. The enable signal 130 from the time synchronization device 101 is a signal indicating whether the clock 120 from the time synchronization device Lot is valid or invalid.

The clock switching circuit 202 provides the clock 121 from the clock receiving circuit 201 to the clock circuit 206 when the enable signal 130 from the time synchronization device 101 is valid;
Furthermore, when the enable signal 130 is invalid, the oscillation circuit 20
3 to provide the clock 122 to the clock circuit 206.

When the power supply 110 from the time synchronization device 101 and the power supply 204 inside the time device are supplied at the same time, the power supply priority circuit 205 outputs the power supply 110 from the time synchronization device 101 with priority, and outputs the power supply 110 from the time synchronization device 101 with priority, and outputs the power supply 110 from the time synchronization device 101 with priority. Clock switching circuit 202. Power is supplied to the clock circuit 206 and the oscillation circuit 203.

With the above configuration, when multiple time devices fl)(2)...(rl) in the same system receive the same clock 120 from the time synchronization device 101, the power source also becomes a time synchronization device. Even if the power supply 204 inside the time device is cut off due to the power received from the time synchronization device 101, as long as the power source 110 inside the time synchronization device 101 continues to receive input, each time device will continue to operate. i! ft) +2)...+n) can be clocked by the clock circuit 206 by inputting the same clock 120 from the time synchronization device 101.

Therefore, each timepiece E (1) +21...
・The same time can be measured using (n).

FIG. 2 is a circuit diagram showing details of the power supply priority circuit 205.

This circuit is composed of a relay 200, and the state shown in this figure is when there is no power supply 110 from the time synchronization device 101. The power supply 204 of the time device itself is outputted through contacts ① and ② of the relay 200. Also, time synchronization device 1
If there is a power supply 110 from 01, the power supply 11 from the time synchronization device 101 is passed through contacts ■ and ■ of the relay 200.
Outputs 0.

(Effects of the Invention) As explained in detail above, when there are multiple time devices in the same system, each time device is supplied with power as well as a clock from the time synchronization device. Even if the internal power supply of the time device is cut off, there is no effect and the time measurements of all the time devices are sure to match.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a time device system according to the present invention, and FIG. 2 is a circuit diagram showing details of a power supply priority circuit. 101...Time synchronization device 102...Time device 110...Power source 120 from the time synchronization device...Clock 121 from the time synchronization device...Clock 122 passed through the clock reception circuit... Clock 130 from the oscillation circuit...Enable signal 20 from the time synchronization device
1...Clock reception circuit 202...Clock switching circuit 203...Oscillation circuit 204...Internal power supply of time device 205...Electronic tA4IE destination circuit 206...Time measurement circuit 207...Battery backup circuit 200...
relay

Claims (1)

[Claims] In a time device system comprising a plurality of time devices and a time synchronization device that provides the same clock to each time device in order to synchronize the timekeeping operations of the plurality of time devices, each of the time devices comprises: , an oscillation circuit that generates a clock, a clock reception circuit that receives a clock from the time synchronization device, and a clock from the oscillation circuit and a clock received by the clock reception circuit according to an enable signal from the time synchronization device. A clock switching circuit that switches to one of the above, a clock circuit that clocks the clock output from the clock switching circuit, an internal power supply, and a power supply from the internal power supply and the time synchronization device, A power priority circuit that outputs the power of the time synchronization device and supplies it to each circuit when power is supplied from the synchronization device, and a backup circuit when both the internal power supply and the power from the time synchronization device are cut off. A time device system consisting of a battery backup circuit for