Battery discharge circuit and discharge method with over discharge protection
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorsMin Xu, Qiming Zhao
Life of this patent
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Abstract
A battery discharge circuit has a switching circuit and a controller. The switching circuit is coupled between a battery and a load. The controller is configured to generate a control signal to control the switching circuit. When the battery voltage drops below a first reference voltage, the controller adjusts the control signal to regulate the battery voltage to be equal to the first reference voltage.
Claims20
A battery discharge circuit comprising:
- a switching circuit coupled between a battery and a load, wherein the switching circuit is configured to receive the battery voltage and provide an output signal to the load;
- and
- a controller configured to generate a control signal to control the switching circuit, wherein when the battery voltage drops below a first reference voltage, the controller adjusts the control signal to regulate the battery voltage to be equal to the first reference voltage.
A controller used in a battery discharge circuit, wherein the battery discharge circuit has a switching circuit coupled between a battery and a load, and wherein the switching circuit is configured to receive the battery voltage and provide an output signal to the load, the controller comprises:
- a first error amplifying circuit configured to receive the battery voltage and a first reference voltage, wherein the first error amplifying circuit generates a first compensation signal based on the difference between the battery voltage and the first reference voltage;
- and
- a PWM circuit coupled to the first error amplifying circuit to receive the first compensation signal, wherein based on the first compensation signal, the PWM circuit generates a control signal to control the switching circuit when the battery voltage drops below the first reference voltage.
A battery discharge method, comprising:
- converting a battery voltage into an output signal through a switching circuit coupled between a battery and a load;
- determining whether the battery voltage drops below a first reference voltage;
- and
- if the battery voltage drops below the first reference voltage, adjusting a control signal controlling the switching circuit to regulate the battery voltage to be equal to the first reference voltage.
Dependencies are inferred from the claim text.