充电保护的控制电路和充电设备

Abstract

本申请实施例提供一种充电保护的控制电路和充电设备，协议模块连接基准电压产生模块，基准电压产生模块还连接模式选择模块，模式选择模块还连接充电保护模块。协议模块在用电设备所需的充电电压发生变化时，输出控制信号至基准电压产生模块，基准电压产生模块根据控制信号调整输出的基准电压，模式选择模块根据基准电压输出屏蔽触发信号至充电保护模块，以使充电保护模块去使能充电保护，从而在充电设备输出的充电电压变化时对充电保护模块进行阶段性屏蔽，所有协议适用于基准电压这一判断逻辑，无需对不同协议设置不同的判断逻辑，降低了判断逻辑的复杂度，减少对充电设备的误保护，提高充电设备和用电设备的安全。

Claims

1. A control circuit for charge protection, characterized in that, include: The protocol module is used to output control signals when the received target charging voltage changes. A reference voltage generation module, connected to the protocol module, is used to adjust the reference voltage according to the control signal. The reference voltage is used to adjust the output voltage of the charging device to the changed target charging voltage. The mode selection module is connected to the reference voltage generation module and is used to output a shielding trigger signal according to the reference voltage. The charging protection module, connected to the mode selection module, is used to enable charging protection according to the shielding trigger signal.

2. The control circuit of claim 1, wherein, The mode selection module includes: a first comparator; The positive input terminal of the first comparator is connected to the reference voltage generation module to receive the reference voltage, and the negative input terminal of the first comparator receives the delayed voltage of the reference voltage; The first comparator is used to output a first trigger signal when the reference voltage is less than the delay voltage.

3. The control circuit of claim 2, wherein, The mode selection module further includes: a second comparator; The positive input terminal of the second comparator receives the delayed voltage, and the negative input terminal of the second comparator is connected to the reference voltage generation module to receive the reference voltage. The second comparator is used to output a second trigger signal when the reference voltage is greater than the delay voltage.

4. The control circuit of claim 2, wherein, The charging protection module includes: an undervoltage protection submodule; The undervoltage protection submodule is connected to the first comparator and is used to enable undervoltage protection according to the first trigger signal.

5. The control circuit of claim 3, wherein, The charging protection module includes: an overvoltage protection submodule; The overvoltage protection submodule is connected to the second comparator and is used to enable overvoltage protection according to the second trigger signal.

6. The control circuit of claim 3, wherein, The mode selection module further includes: a delay submodule; The input terminal of the delay submodule is connected to the reference voltage generation module, and the output terminal of the delay submodule is connected to the negative input terminal of the first comparator and the positive input terminal of the second comparator. The delay submodule is used to output a delayed voltage based on the reference voltage.

7. The control circuit of claim 6, wherein, The delay submodule includes: resistors and capacitors; The first end of the resistor is connected to the reference voltage generating module; The second end of the resistor is connected to the second end of the capacitor, and the delayed voltage of the reference voltage is output. The first terminal of the capacitor is grounded.

8. The control circuit according to any one of claims 1 to 7, characterized in that The protocol module includes multiple protocol sub-modules, and different protocol sub-modules support different fast charging protocols.

9. The control circuit according to any one of claims 1 to 7, characterized in that Also includes: A constant voltage control module, connected to the reference voltage generation module, is used to adjust the output voltage of the charging device according to the reference voltage.

10. A charging device, characterized by The control circuit for charging protection as described in any one of claims 1-9.

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