Overcurrent protection circuit for MCU and control method of overcurrent protection circuit
An overcurrent protection circuit and resistance technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc. The effect of improving safety and reliability, avoiding burnout, and reliable control methods
Active Publication Date: 2020-01-24
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
However, when the MCU is working, the input and output current of the IO port cannot exceed its maximum value.
When the switching power supply supplies power to the MCU, if the IO port is over-current due to a short circuit of the power supply, the MCU will be burned, and the more powerful the control function of the MCU, the higher its price. If the MCU is damaged, it will cause economic losses; More pins, more difficult to replace
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[0028] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0029] In digital circuits, the level of voltage is represented by logic levels, which include high level and low level. Digital circuits formed by different components have different logic levels corresponding to voltages. The logic level is defined by the threshold level. For example, in a TTL gate circuit, a voltage greater than...
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The invention discloses an overcurrent protection circuit for an MCU and a control method of the overcurrent protection circuit. The overcurrent protection circuit is used for protecting the MCU. Theovercurrent protection circuit for the MCU comprises a current sampling module, a voltage comparison module, an MCU connection module, a timing trigger module and an information triggering module; thecurrent sampling module collects a current signal I inputted into the MCU and converts the current signal into a voltage signal; the voltage signal is outputted to the voltage comparison module and is compared with a reference voltage; if the voltage signal is larger than the reference voltage, the current signal I is over-current, and the voltage comparison module outputs a high electric level;and if the voltage signal is smaller than the reference voltage, the current signal I is not over-current, and the voltage comparison module outputs a low electric level; when the current signal I isover-current, the current signal I is connected with the MCU through a protection connection circuit, a timer T starts timing, and an information prompting module sends an over-current prompting signal. The overcurrent protection circuit for MCU and the control method have the advantages of structural simplicity, high reliability, accurate current detection, rapid circuit response, low cost and improved safety. With the overcurrent protection circuit for MCU and the control method of the invention adopted, the MCU can be effectively prevented from being burnt due to overcurrent.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an MCU overcurrent protection circuit and a control method thereof. Background technique [0002] With the rapid development of technology, the application of MCU is more and more extensive. Due to the wide application of MCU, not only the controller is more and more intelligent and simple, but also the operation speed is greatly improved, and the control is more precise and high-speed. However, when the MCU is working, the input and output current of the IO port cannot exceed its maximum value. When the switching power supply supplies power to the MCU, if the IO port is over-current due to a short circuit of the power supply, the MCU will be burned, and the more powerful the control function of the MCU, the higher its price. If the MCU is damaged, it will cause economic losses; There are many pins and it is difficult to replace them. Therefore, it is important to ...
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IPC IPC(8): H02H3/093
CPCH02H3/0935
Inventor 刘兆斌朱矿新
Owner GREE ELECTRIC APPLIANCES INC