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Charging-and-discharging-control-circuit-and-charging-type-power-supply-unit

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Details

Inventors: Zhang, Wei;
Assignee: Seiko Instruments Inc. (Chiba, JP)
Primary Examiner: Tibbits; Pia
Assistant Examiner:
Attorney, Agent or Firm: Adams & Wilks

The invention provides: a charging and discharging control circuit which includes a charging and discharging control terminal having a test function as well and which is capable of conducting switch over among a normal application state, a charging and discharging prohibition state, and a test state; and a charging type power supply unit. Any one of a level "L", "H", or "M" of a voltage inputted to a charging and discharging control terminal is selected using the charging and discharging control terminal and a test fuse to allow switch over to the normal application state, the charging and discharging prohibition state, or the test state. In the test state, two modes for shortening a test delay time are realized depending on whether or not the test fuse is cut.

DETAILED DESCRIPTION The present invention aims at making a terminal for charging and discharging control have a test function as well so that a single pin has both a charging and discharging control function and a test function to thereby reduce cost.
Thus, an object of the present invention is to control a detection delay time in a charging and discharging control circuit using the test function of the above-mentioned charging and discharging control terminal and to provide plural test time shortening modes in order to achieve cost reduction.
In order to attain the above-mentioned objects, the present invention has the following constitution.
According to a first aspect of the present invention, in a charging type power supply unit including: a switch circuit and a secondary battery connected in series with an external power supply terminal; and a charging and discharging control circuit connected in parallel with the secondary battery in order to control the switch circuit, the charging and discharging control circuit is provided with a charging and discharging control terminal, and the control circuit has a unit which, in accordance with a voltage level inputted to the control terminal, monitors one or both of a voltage and a current of the secondary battery to control the switch circuit to thereby conduct switch over to any one of a normal application state in which charging and discharging of the secondary battery are controlled (hereinafter referred to as a normal state), a charging and discharging prohibition state in which the charging and discharging of the secondary battery are forcibly prohibited (hereinafter referred to as a charging and discharging prohibition state), and a test state in which characteristics of the control circuit are evaluated (hereinafter referred to as a test state).
In addition, the charging and discharging control circuit is provided with a built-in delay circuit including an oscillator and a counter and becomes the normal state when a voltage inputted to the charging and discharging control terminal is at a certain level

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