JPH0727039B2 - Electronic clock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power generation mechanism, a charge storage member that stores electric power generated by the power generation mechanism, and a buck-boost that boosts or lowers the voltage generated in the charge storage member. The present invention relates to an electronic timepiece having a voltage detecting means and a voltage detecting means, and using the stepped-up / down voltage as a power source of a system, and particularly to a detecting operation of the voltage detecting means.

[Outline of Invention]

The present invention has a power generation mechanism, a charge storage member for storing electric power generated by the power generation mechanism, a step-up / down means for stepping up / down the voltage generated in the charge storage member, and a voltage detection means by sampling operation. In an electronic timepiece that uses a piezo voltage as a power source of a system, the voltage detection sampling of the voltage detection means is performed immediately before a heavy load output such as motor drive or lamp lighting to obtain a previous heavy load. The voltage of each part is detected after the power supply voltage that has dropped due to the drive is sufficiently restored to the original level, so that accurate detection is possible and the reliability of the system is improved.

[Conventional technology]

Conventionally, electronic timepieces were operated by using primary batteries such as button type batteries, but in recent years, in order to extend the battery life of timepieces, there is a power generation mechanism such as a solar cell, and the generated power is supplied to a secondary battery. An electronic timepiece that is semi-permanently operated by charging and using it, or recently, by storing the generated power in an electric double layer capacitor instead of a secondary battery and using it as a power source has been put on the market. further,
An electronic timepiece having an electromagnetic induction power generation mechanism inside the timepiece and utilizing the generated power is also conceivable, and the details are disclosed in Japanese Patent Application No. 59-246778. As disclosed in the patent, the electronic timepiece has a booster circuit inside to boost the voltage stored in the charge storage member and use it as a power source in order to use the generated power effectively. ing. Further, such an electronic timepiece optimally controls the magnification control of the boosting means, the overcharge protection of the charge storage member, etc. by detecting the voltage accumulated in the charge storage member and the boosted voltage thereof. ing.

[Problems to be solved by the invention]

However, since the electric capacity of such a charge storage member and step-up / down power supply is much smaller than that of a battery, a large voltage drop occurs due to heavy load driving such as motor driving or lamp lighting, and the voltage detection cannot be performed accurately, which is optimal. Difficult to control.

[Means for solving problems]

An electronic timepiece of the present invention includes a power generation mechanism, a charge storage member that stores electric power generated by the power generation mechanism, a voltage detection unit that detects a voltage of the charge storage member by a sampling operation, and a voltage detection unit of the voltage detection unit. And a timing control means for controlling the sampling timing so that it is immediately before the heavy load output including at least the motor drive.

[Action]

By placing the voltage detection sampling immediately before the output of the heavy load, it is possible to minimize the fluctuation of the power source due to the heavy load.

〔Example〕

FIG. 1 is a block diagram of an electronic timepiece according to the present invention.
In FIG. 1, reference numeral 4 is a voltage detecting means, and the voltage detecting means 4 rectifies the super power generated by the power generation mechanism 1 by the diode 8 and charges the charge storage member 3 to generate the voltage Vs.
The limiter means of 2 is controlled to detect c and prevent overcharge. Further, the voltage detecting means also detects the voltage Vss obtained by stepping up / down Vsc by the step-up / step-down means 9 and thereby optimally controls the step-up / down means. Also,
The voltage detecting means performs voltage detection by sampling operation, and the timing thereof is controlled by the signal Sp obtained from the timing control means of 6. The timing control means 6 is configured to generate a signal Dr for driving the heavy load 7 and a sampling signal Sp which becomes active immediately before the signal Dr by a signal obtained from the time counting means 5 and thereby the voltage Sampling is performed immediately before heavy load driving.

FIG. 2 is a specific example of the timing control means.
In FIG. 2 (a), the control signal Sig and the clock signal CL obtained from the clock means are input to 21 D-type pre-flops (hereinafter referred to as F / F), and the output of the F / F. Q, is NA
The heavy load drive signal Dr and the sampling signal Sp are formed through an ND gate and an inverter. This is shown in the timing chart of FIG. In this circuit, the control signal Sig is changed to the heavy load drive signal Dr by the clock signal CL.
And the sampling signal Sp are separated into two, and the timing is set so that the signal Sp is positioned immediately before the signal Dr.

〔The invention's effect〕

According to the present invention, by the structure having the timing control means for controlling the timing of the voltage detection sampling of the voltage detection means at least immediately before the heavy load output including the motor drive, the power consumption of the ordinary electronic timepiece is large. Once the motor drive that becomes the load output that closes the part is finished,
For example, the voltage can be detected immediately before the next heavy load in which the charge amount of the power generation mechanism is accurately reflected in the voltage of the secondary battery while the voltage of the charge storage member such as the secondary battery is recovered. It can accurately detect the amount of charge, has a built-in solar cell and other power generation means, and can control the overcharge prevention circuit in electronic timepieces in which the power supply voltage fluctuates drastically, for example when controlling a booster circuit. This has the effect of being able to perform charging based on an accurate amount of charge and greatly improving the reliability of driving the timepiece.

[Brief description of drawings]

FIG. 1 ... Block diagram of electronic timepiece according to the present invention FIG. 2 (a) Diagram showing one specific example of timing control means (b) Timing chart 1 ... Power generation mechanism, 2 ... Limiter means, 3 ... … Charge storage member, 4 …… Voltage detecting means, 5 …… Time measuring means, 6 …… Timing control means, 7 …… Heavy load, 9 …… Boosting means, Vss …… Vsc buck-boost voltage

Claims (1)

[Claims] 1. A power generation mechanism, a charge storage member for storing electric power generated by the power generation mechanism, voltage detection means for detecting a voltage of the charge storage member by a sampling operation, and voltage detection sampling of the voltage detection means. An electronic timepiece having timing control means for controlling timing so that it is immediately before a heavy load output including at least motor driving.