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 Permanent-magnet electric motor for circulation pumps of heating systems
The aim of the present invention is to provide an electric motor for circulation pumps of heating ...


 Electronic instrument

Details
Inventors: Utsunomiya, Fumiyasu; Yoshida, Yoshifumi;
Assignee: Seiko Instruments Inc. (JP)
Primary Examiner: Leja; Ronald W.
Assistant Examiner:
Attorney, Agent or Firm: Adams & Wilks

An electronic instrument in which erroneous operation after power is applied thereto even in the case where a power source voltage is not quickly raised. Power is generated by a power source such as a thermoelectric conversion device and stored in a secondary battery or charge storage device through a optional boosting circuit. A control circuit and a main circuit are supplied with the power. However, the control circuit has a lower minimum operating voltage than the main circuit. Thus, with the increase in level of the power source voltage, the control circuit starts to operate before the main circuit and outputs a control signal to prevent the main circuit from operating in such a manner that a through current is prevented and the main circuit is prevented from drawing appreciable current from the power source circuit, which would prevent the voltage of the secondary battery or the charge storage device from increasing. When the power source voltage is increased to a voltage level at which the main circuit can operate in a stable manner, the control circuit enables operation of the main circuit.

DETAILED DESCRIPTION It is an object of the present invention to provide an electronic instrument which can prevent an erroneous operation immediately after feeding even in the case where a power source voltage is not quickly raised.
Another object of the present invention is to prevent such a case that in an electronic instrument including electric power generating means and storage means, a large current flows through a load circuit at a halfway power source voltage so that the power source voltage can not be increased.
An electronic instrument of the present invention includes an electronic instrument main body circuit, a control circuit capable of operating at a threshold voltage lower than that of the electronic instrument main body circuit, and a power source circuit for feeding the electronic instrument main body circuit and the control circuit, and is characterized in that the control circuit outputs a control signal to stop the operation of the electronic instrument main body circuit until the feeding voltage from the power source circuit to the electronic instrument main body circuit becomes a minimum operation voltage at which electronic instrument main body circuit normally operates.
When the power source circuit start to feed, the control circuit having the low threshold voltage first starts to operate with the increase of the power source voltage, and outputs the control signal to stop the operation of the electronic instrument main body circuit.
When the power source voltage is further increased and becomes the voltage at which the electronic instrument main body circuit can normally operate, the control circuit operates the electronic instrument main body circuit through the control signal.
By this, an erroneous operation of the electronic instrument is prevented.
The power source circuit may be made up of electric power generating means for generating electric power and storage means for storing the electric power generated in the electric power generating means.
It is preferable to use a thermoelectric conversion element as the electric power generating means in view of miniaturization


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