Power supply device
First Claim
1. A power supply device integrally combined with an electrical device body including a load, the power supply device comprising:
- a rechargeable battery for supplying power to the load;
charge terminals electrically connected to the rechargeable battery;
a residual capacity detector supplied with power from the rechargeable battery for operation to detect a residual capacity of the rechargeable battery based on an amount of charged current to the rechargeable battery and an amount of discharged current from the rechargeable battery to the load;
a switch provided between the rechargeable battery and the residual capacity detector;
a battery voltage detector for detecting a value of battery voltage of the rechargeable battery;
a charge controller for stopping charging the rechargeable battery when the residual capacity detected by the residual capacity detector has become 100%, and when the value of the battery voltage detected by the battery voltage detector has become a value lower than a peak value after the value of the battery voltage passes the peak value; and
a power supply stop controller for controlling to turn off the switch to stop the power supply from the rechargeable battery to the residual capacity detector when the residual capacity detected by the residual capacity detector becomes less than a predetermined threshold value,wherein the rechargeable battery has;
a charge characteristic that if charging of the rechargeable battery is started when the rechargeable battery has a residual capacity less than the predetermined threshold value, the rechargeable battery reaches a state of full charge when the value of the battery voltage of the rechargeable battery has become a value lower than a peak value after the value of the battery voltage passes the peak value; and
a charge characteristic that if the charging of the rechargeable battery is started when the rechargeable battery has a residual capacity equal to the predetermined threshold value or more, the rechargeable battery reaches the state of full charge before the value of the battery voltage of the rechargeable battery shows the peak value, andwherein the charge controller does not change the value of the residual capacity to 100% until a predetermined time elapses after starting charging the rechargeable battery, even if the value of the battery voltage of the rechargeable battery has become a value lower than a peak value after the value of the battery voltage passes the peak value, and changes the value of the residual capacity to 100% and stops the charging of the rechargeable battery when the value of the battery voltage of the rechargeable battery has become a value lower than a peak value after the value of the battery voltage passes the peak value and the predetermined time elapses after the starting charging the rechargeable battery or thereafter.
3 Assignments
0 Petitions
Accused Products
Abstract
Provided is a power supply device integrally combined with an electrical device body including a motor, comprising a rechargeable battery for supplying power to the motor, a microcomputer for detecting a residual capacity and a battery voltage of the battery, and a switching element provided between the battery and the microcomputer. The microcomputer stops charging the battery when the detected residual capacity has become 100%, and when the detected value of the battery voltage has become lower than a peak value after the value of the battery voltage passes the peak value, making it possible to prevent overcharging of the battery. The microcomputer also controls to turn off the switching element to stop the power supply from the battery to the microcomputer when the residual capacity becomes less than a predetermined threshold value, making it possible to reduce power consumption.
5 Citations
6 Claims
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1. A power supply device integrally combined with an electrical device body including a load, the power supply device comprising:
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a rechargeable battery for supplying power to the load; charge terminals electrically connected to the rechargeable battery; a residual capacity detector supplied with power from the rechargeable battery for operation to detect a residual capacity of the rechargeable battery based on an amount of charged current to the rechargeable battery and an amount of discharged current from the rechargeable battery to the load; a switch provided between the rechargeable battery and the residual capacity detector; a battery voltage detector for detecting a value of battery voltage of the rechargeable battery; a charge controller for stopping charging the rechargeable battery when the residual capacity detected by the residual capacity detector has become 100%, and when the value of the battery voltage detected by the battery voltage detector has become a value lower than a peak value after the value of the battery voltage passes the peak value; and a power supply stop controller for controlling to turn off the switch to stop the power supply from the rechargeable battery to the residual capacity detector when the residual capacity detected by the residual capacity detector becomes less than a predetermined threshold value, wherein the rechargeable battery has;
a charge characteristic that if charging of the rechargeable battery is started when the rechargeable battery has a residual capacity less than the predetermined threshold value, the rechargeable battery reaches a state of full charge when the value of the battery voltage of the rechargeable battery has become a value lower than a peak value after the value of the battery voltage passes the peak value; and
a charge characteristic that if the charging of the rechargeable battery is started when the rechargeable battery has a residual capacity equal to the predetermined threshold value or more, the rechargeable battery reaches the state of full charge before the value of the battery voltage of the rechargeable battery shows the peak value, andwherein the charge controller does not change the value of the residual capacity to 100% until a predetermined time elapses after starting charging the rechargeable battery, even if the value of the battery voltage of the rechargeable battery has become a value lower than a peak value after the value of the battery voltage passes the peak value, and changes the value of the residual capacity to 100% and stops the charging of the rechargeable battery when the value of the battery voltage of the rechargeable battery has become a value lower than a peak value after the value of the battery voltage passes the peak value and the predetermined time elapses after the starting charging the rechargeable battery or thereafter. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification