JPH0455617U

JPH0455617U -

Info

Publication number: JPH0455617U
Application number: JP9679890U
Authority: JP
Priority date: 1990-09-14
Filing date: 1990-09-14
Publication date: 1992-05-13

Description

[Brief explanation of the drawing]

第１，２図は、それぞれこの考案の携帯型電子
機器の一実施例を示す概略斜視図及び回路構成図
、第３図ないし第５図は、それぞれ第２図に示し
た電源判別回路の異なる実施例を示す回路構成図
、第６，７図は、それぞれ従来の携帯型電子機器
の一例を示す概略斜視図及び回路構成図である。２……キーボード、１０……内蔵電池、１１…
…ＡＣアダプタ、１，２１……携帯型電子機器、
２２……高速動作クロツク発生回路、２３……低
速動作クロツク発生回路、２４……動作クロツク
選択回路、２５，３１，４１……電源判別回路、
２６，３２……電圧検出回路、２７，３３……電
圧比較回路、４２……給電端子、４３……接片、
４４……接点。 1 and 2 are a schematic perspective view and a circuit configuration diagram showing an embodiment of the portable electronic device of this invention, respectively, and FIGS. 3 to 5 show different versions of the power discriminating circuit shown in FIG. 2, respectively. FIGS. 6 and 7 are a schematic perspective view and a circuit diagram showing an example of a conventional portable electronic device, respectively. 2...Keyboard, 10...Built-in battery, 11...
...AC adapter, 1,21...portable electronic device,
22...High speed operation clock generation circuit, 23...Low speed operation clock generation circuit, 24...Operating clock selection circuit, 25, 31, 41...Power source discrimination circuit,
26, 32... Voltage detection circuit, 27, 33... Voltage comparison circuit, 42... Power supply terminal, 43... Contact piece,
44...Contact.

Claims

[Claims for Utility Model Registration] (1) The power source is compatible with both an external power source and a built-in battery, and processing instructions input via the keyboard are executed in synchronization with a predetermined operation clock generated internally. A high-speed operating clock generation circuit that generates a high-speed operating clock;
a low-speed operating clock generation circuit that generates a low-speed operating clock; a power supply discriminating circuit that determines whether an external power supply or a built-in battery is used as the power source; It acts on the generation circuit or the low-speed operation clock generation circuit, and selects the high-speed operation clock when an external power supply is used, and selects the low-speed operation clock when the built-in battery is used, and selectively uses the selected operation clock. A portable electronic device characterized by comprising an operation clock selection circuit. (2) The power supply determination circuit includes a voltage detection circuit that detects a voltage downstream of a power supply junction of the external power supply and the built-in battery, and a voltage detection circuit that compares the detected voltage of the voltage detection circuit with a reference voltage to determine whether the power supply 2. The portable electronic device according to claim 1, further comprising a voltage comparison circuit for determining whether the external power source or the built-in battery is used. (3) The power supply determination circuit includes a voltage detection circuit that detects the voltage of a line extending from an external power supply receiving terminal to a power supply junction of the built-in battery, and a voltage detection circuit that compares the detected voltage of this voltage detection circuit with a fixed reference voltage. 2. The portable electronic device according to claim 1, further comprising a voltage comparison circuit for determining whether the external power source or the built-in battery is used as the power source. (4) The power supply determination circuit includes a current detection circuit that detects a current flowing through a line extending from an external power supply receiving terminal to a power supply junction of the built-in battery, and a magnitude comparison between the detected current of this current detection circuit and a fixed reference current. 2. The portable electronic device according to claim 1, further comprising a current comparison circuit for determining whether the external power source or the built-in battery is used as the power source. (5) The power source determination circuit includes a contact piece that is provided at a power receiving terminal of the external power source and is mechanically displaced upon connection with a power feeding terminal of the external power source, and electrically detects the displacement of this contact piece. 2. The portable electronic device according to claim 1, further comprising displacement detecting means for determining whether or not the external power source is connected.