Charge and discharge control circuit, device, and method

Abstract

This invention discloses a charging and discharging control circuit, device, and method, including a first controllable switch, a second controllable switch, a first sampling module, a first operational amplifier module, a second sampling module, and a first comparator module. The second controllable switch and the first controllable switch are connected in series on the same charging branch. The sampling input terminal of the first sampling module is connected to the charging branch for current sampling and detection. The non-inverting input terminal of the first operational amplifier module is used to receive a constant current reference signal, and the inverting input terminal is connected to the output terminal of the first sampling module. The output terminal is connected to the control terminal of the first controllable switch. The sampling input terminal of the second sampling module is connected to the battery connection terminal of the charging branch for voltage sampling and detection. The non-inverting input terminal of the first comparator module is used to receive a voltage limiting reference signal, and the inverting input terminal is connected to the output terminal of the second sampling module. The output terminal is connected to the control terminal of the second controllable switch. This invention can stably and accurately control the battery's termination voltage.

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