Electricity: battery or capacitor charging or discharging – Battery or cell discharging – Regulated discharging
Patent
1999-01-22
2000-10-24
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
Regulated discharging
320135, H02J 700
Patent
active
061372676
ABSTRACT:
A limiting circuit for controlling overshoot in a charge current in a battery recharging system includes a current amplifier receiving input indicative of charge current in a rechargeable battery circuit and generating a current error signal, a voltage amplifier receiving input indicative of charge voltage in the rechargeable battery circuit and generating a voltage error signal, and a power amplifier receiving a first signal indicative of power in a switching voltage regulator and a second power signal indicative of power in the rechargeable battery circuit, and generating a power error signal. The limiting circuit compares the voltage error signal, the current error signal, and the power error signal to determine the error signal having the greatest value, and generates an input signal to a pulse width modulation comparator. The limiting circuit also includes an internal current source, a first transistor coupled to the current amplifier, a second transistor coupled to the voltage amplifier; and a third transistor coupled to the power amplifier. The first transistor, the second transistor, and the third transistor are coupled to the internal current source to determine the error signal having the greatest value. To prevent reverse current flow in the switching voltage regulator, a low current comparator receives a signal indicative of the current flowing in the switching voltage regulator, and generates an output signal. A transistor receives the output signal from the low current comparator, and generates a signal to maintain the current flowing in the switching regulator circuit above a threshold value.
REFERENCES:
patent: 5552695 (1996-09-01), Schwartz
patent: 5705919 (1998-01-01), Wilcox
patent: 5723970 (1998-03-01), Bell
patent: 5731694 (1998-03-01), Wilcox et al.
patent: 5747976 (1998-05-01), Wong et al.
patent: 5815015 (1998-09-01), Nelson et al.
Cummings John
Kates Barry K.
Bertani Mary Jo
Dell Computer Corporation
Luk Lawrence
Terrile Stephen A.
Wong Peter S.
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