Low power consumption circuit and secondary battery cell protection circuit
AssigneeMitsumi Electric Co., Ltd.
InventorYukihiro Terada
Life of this patent
Estimating the term…
Abstract
A low power consumption circuit has a circuit that cuts power to a portion of the low power consumption circuit under previously specified conditions in order to reduce consumption of power, a high impedance circuit that becomes high impedance when power to the portion of the low power consumption circuit is cut off, and a low current supply circuit supplying a low current to the high impedance circuit to prevent mistaken activation of the low power consumption circuit due to external interference.
Claims6
A low power consumption circuit comprising:
- a circuit that cuts power to a portion of the low power consumption circuit under an over-discharge condition in order to reduce consumption of power;
- a high impedance circuit that becomes high impedance when power to the portion of the low power consumption circuit is cut off;
- and
- a low current supply circuit supplying a low current to the high impedance circuit so as to prevent mistaken activation of the low power consumption circuit due to external interference.
A secondary battery cell protection circuit comprising:
- an over-discharge detection circuit detecting an over-discharge of the secondary battery cell;
- a discharge control circuit controlling a discharge of a secondary battery cell depending on a voltage of the secondary battery cell, the discharge control circuit connected to the over-discharge detection circuit;
- and
- a low current supply circuit supplying a low current wherein the low current supply circuit is provided within the secondary battery cell protection circuit;
- wherein the secondary battery cell protection circuit cuts power to a part or all of the secondary battery cell protection circuit when the over-discharge detection circuit detects an over-discharge of the secondary battery cell and supplies the low current from the low current supply circuit to a power line at which a high impedance circuit has been formed because the power supply is cut off.
A charge/discharge control device comprising:
- a secondary battery cell protection circuit including an over-discharge control circuit, an overcharge control circuit and a low current supply circuit;
- a charge control FET and a discharge control FET, each provided on a charge/discharge circuit;
- and
- a resistor connected between a gate of the charge control FET and the charge/discharge circuit;
- wherein when an over-discharge occurs, the charge/discharge control device applies an output of the over-discharge control circuit to the over-discharge control FET and supplies a low current from the low current supply circuit to the resistor.
A charge/discharge control device comprising:
- a secondary battery cell protection circuit comprising an over-discharge control circuit, an overcharge control circuit and a low current supply circuit;
- a charge control FET and a discharge control FET, each provided on a charge/discharge circuit;
- a switching transistor connected between the charge control FET gate and the charge/discharge circuit;
- and
- a resistor connected between the switching transistor base and the charge/discharge circuit and overcharge control circuit output terminal,
- wherein, when an over-discharge occurs, the charge/discharge control device applies an output of the over-discharge control circuit to the over-discharge control FET and supplies a low current from the low current supplies circuit to the switching transistor base.
Dependencies are inferred from the claim text.