JPS61195388A - Timepiece device - Google Patents

Abstract

PURPOSE:To deal with supply interruption by a charging type battery of a small capacity by alternately and switchingly using a high precision crystal oscillator used during the time of a supply from an AC source and a low precision crystal oscillator operating by current supply from a battery. CONSTITUTION:During the time of a current supply from an AC source, electric current is supplied to an inner logic circuit from an electrical source 1 converting the AC into DC, while the battery 2 is charged. In case of supply interruption, when there is no current supply from the AC source, a first switch 3 senses the supply interruption and switches the power supply source of the inner logic circuit to the battery 2. At this time, the high precision crystal oscillator 7 requiring a large power consumption is eliminated from the consumer of the battery 2. A second switch 6 senses the power supply interruption at the same time as the first switch 3 is energized so that the time counting signal source to a time counting integrating circuit 5 is changed from the high precision crystal oscillator 7 to the high precision crystal oscillator 8. In such a manner, power supply is made from the battery 2 only to the element requiring a small power so as to continue time counting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a timepiece device suitable for continuously counting time with high precision.

[Conventional technology]

Figure 2 is a configuration diagram of the time counter of a conventional clock device equipped with a rechargeable battery that takes power outages into consideration.
c1 is a power source that converts AC power into DC voltage for operation of the internal logic circuit; 2 is a battery that is charged by AC and generates DC voltage; and 3 is the above-mentioned power source that serves as the power supply for the internal logic circuit while AC is being supplied. A switching device selects the power source 1, detects the power failure in the event of a power failure, and changes the power supply for the internal logic circuit to the battery 2, 4 is a crystal oscillator, and 5 is a time counting integrated circuit.

A conventional clock device is configured as described above, and while AC power is being supplied from a power company or the like, a power source 1 that converts AC to DC supplies power to an internal logic circuit and charges a battery 2. ing. When a power outage occurs and the AC power supply is no longer supplied, the switching device 3 detects the power outage and changes the power supply of the internal logic circuit to the battery 2, and the battery 2 operates the internal logic circuit according to the charged capacity. let

[Problem that the invention seeks to solve]

Conventional clock devices such as those mentioned above are low-precision devices that use low-precision crystal oscillators with low power consumption, so the rechargeable battery for power outage countermeasures has a small capacity, but it is necessary to use high-precision crystal oscillators with high power consumption. The problem with the high-precision equipment used is that it must be equipped with a large-capacity rechargeable battery as a countermeasure against power outages.

This invention was made in order to solve these problems, and it is possible to effectively count time with high accuracy in areas with relatively good AC power supply conditions. The purpose is to obtain a clock device that can cope with power outages.

[Failure to solve the problem]

The clock device according to the present invention uses a high-precision crystal oscillator for time counting while AC power is supplied, and uses a low-precision crystal oscillator when detecting a power outage and operates on battery power. A second switch is provided so that the timer is used for time counting.

[Effect]

In this invention, the use of the high-precision crystal oscillator and the low-precision crystal oscillator for time counting is selected based on the detection and restoration of a power outage, and the high-precision crystal oscillator is not supplied with power from the battery, so it is a countermeasure against power outages. You can reduce the capacity of Nodame's battery.

〔Example〕

FIG. 1 is a configuration diagram showing a time counting section of a clock device according to an embodiment of the present invention. In the figure, 1 is a power source that converts an AC power source into a DC voltage for operating the internal logic circuit, and 2 is a power source that is charged by the AC power source. The battery 3 that generates DC voltage selects the above power supply 1 as the power supply for the internal logic circuit while the AC power supply is being supplied, and in the event of a power outage, it detects the power failure and switches the power supply for the internal logic circuit to the above power supply. 5 is an integrated circuit for time counting; 6 is a switch for changing the time counting signal to the high precision crystal oscillator 7 while AC power is being supplied; This is a second switch that changes the time counting signal to be supplied from the low-precision crystal oscillator 8 when a power outage is detected.

In the clock device configured as described above, while AC power is being supplied from the electric power company etc., power is supplied from the power supply 1 that converts AC to DC to the internal logic circuit, and the battery 2 is charged. . When a power outage occurs and AC power is no longer supplied, the first switch 3 detects the power outage and switches the power supply for the internal logic circuit to the battery 2. At this time, the high-precision crystal oscillator 7, which consumes a large amount of power, is excluded from the power supply target of the battery 2. Simultaneously with the operation of the first switch 3 described above, the second switch 6 detects a power outage, and changes the time counting signal source to the time counting integrated circuit 5 from a high precision crystal oscillator 7 to a low precision crystal oscillation. Change to child 8. In this way, when a power outage occurs, power is supplied from the battery 2 only to elements with low power consumption, and time counting continues.

〔Effect of the invention〕

As explained above, this invention is configured so that the objects of power supply by the battery during a power outage are limited to elements with small power consumption, so the capacity of the battery for power supply during a power outage can be reduced, and a highly accurate power outage countermeasure can be implemented at low cost. effective.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a time counting section of a timepiece device according to an embodiment of the present invention, and FIG. 2 is a configuration diagram showing a time counting section of a conventional timepiece device. In the figure, 1 is a power supply, 2 is a battery, 3 is a first switch,
6 is a second switch, 7 is a high-precision crystal oscillator, and 8 is a low-precision crystal oscillator. Note that the same reference numerals in each figure indicate the same or corresponding parts. Patent applicant: Mitsubishi Electric Corporation Procedural amendment (voluntary) 6+10・Mo18

Claims (1)

[Claims] A power supply that converts the AC power supply into a DC voltage for operation of the internal logic circuit, a battery that is charged by the AC power supply and generates the DC voltage for operation, and a power supply for the internal logic circuit while the AC power supply is being supplied. a first switch that selects the power source as the power source, detects the power failure in the event of a power outage, and changes the power supply of the internal logic circuit to the battery; and a first switch that is driven by the power source to generate a time counting signal. High precision crystal oscillator,
A low-precision crystal oscillator that is driven by the battery and generates a time counting signal by the operation of the first switching device in the event of a power outage, and a low precision crystal oscillator that is driven by the battery to generate a time counting signal while the AC power supply is being supplied with the time counting signal. A second signal is supplied from a high-precision crystal oscillator, and in the event of a power outage, detects the power outage and changes the time counting signal to be supplied from the low-precision crystal oscillator.
A clock device equipped with a switching device.