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发明公开
CN104037745A 一种输出过流保护电路及具有过流保护功能的灯具 无效 - 驳回

一种输出过流保护电路及具有过流保护功能的灯具
摘要：
本发明实施例公开了一种输出过流保护电路及具有过流保护功能的灯具，该电路包括：稳压器、开关器和采样器，其中，稳压器包括电压调节端，当电压调节端的电压绝对值减少时稳压器输出端的电压绝对值减小，稳压器的接地端连接到接地点，稳压器的输入端用于连接到电源，稳压器的输出端用于连接到输出过流保护电路的负载；开关器的第一端连接到电压调节端，开关器的第二端连接到接地点，开关器的驱动端连接到采样器的输出端；采样器用于采样稳压器输出端的电流，并且在采样到稳压器输出端的电流超过电流限定值时输出驱动信号控制开关器导通，从而降低所述电压调节端的电压。本发明能够在负载电流超过最大允许值时，保护电路不被烧毁。
摘要（英）：

The embodiment of the invention discloses an output over-current protection circuit and a lamp with an over-current protection function. The circuit comprises a voltage regulator, a switch and a sampler. The voltage regulator has a voltage regulation end. The absolute value of voltage at the output end of the voltage regulator decreases when the absolute value of voltage at the voltage regulation end decreases. The grounding end of the voltage regulator is connected to a grounding point, the input end of the voltage regulator is used for being connected to a power supply, and the output end of the voltage regulator is used for being connected to a load of the output over-current protection circuit. A first end of the switch is connected to the voltage regulation end, a second end of the switch is connected to the grounding point, and a driving end of the switch is connected to the output end of the sampler. The sampler is used for sampling current at the output end of the voltage regulator, and outputting a driving signal to cause the switch to be switched on so as to reduce the voltage at the voltage regulation end when the sampled current at the output end of the voltage regulator exceeds a current limit value. According to the invention, the circuit can be protected from being burned out when the load current exceeds the maximum allowed value.

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