Electric motor protector and control method thereof
A control method and protector technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of high dependence and large space occupied by capacitors, and achieve the effects of saving costs, simplifying circuit design, and solving the limitation of storage times
Inactive Publication Date: 2010-05-26
ANHUI ZHONGDIAN XINGFA & XINLONG TECH CO LTD
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Problems solved by technology
In this way, a large capacitor is required to provide sufficient energy support for the system when the system is powered off. This capacitor often occupies a large space and is highly dependent on the special chip for detecting the power-off time of the protector. The MCU that transmits the power-off signal to the motor protector will not be able to truly realize this function
Method used
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[0012] like figure 1 As shown, a motor protector includes a protector central control unit MCU, and the central control unit MCU is connected to a memory circuit through a bus interface. The memory circuit includes a memory chip U2, resistors R5 and R4, and the bus interface of the memory chip U2 is connected to the power supply VDD through the resistors R5 and R4. The model of the memory chip U2 is FM24CL64, its pins 1, 2, and 3 are device sub-address configuration pins; pin 4 is the power ground; pins 5 and 6 are I2C bus interfaces, and the central control unit MCU can read and write from the memory chip U2 through this interface Data, these two pins are pulled up to 3.3V through resistor R4 and resistor R5, so as to ensure normal bus communication; pin 7 is a write protection pin, when the pin is high, the memory chip U2 cannot be written , when the pin is low level, the memory chip U2 can be written; pin 8 is the power input pin, and the input voltage is +3.3V.
[0013] ...
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The invention discloses an electric motor protector and a control method thereof. The electric motor comprises a protector central control unit MCU, and is characterized in that the central control unit MCU is connected with a storage circuit through a bus interface. By adopting the structure and the method, compared with the prior art, and by adopting the characteristic that an FRAM technique is merged with an RAM and an ROM, the electric motor protector has the read-write speed of the RAM and can perform power-down maintenance. A memory chip FM24CL64 has no time delay for writing data, the FRAM read and write time is not limited in an environment of 3.3V, and the data storage time can reach 10 to 45 years. The electric motor protector needs no detection of power-cut time, can save the power-cut time by only writing the current time into the electric motor protection every 1 second, and also needs no large capacitor which occupies a large space; besides the electric motor protector solves the problem of limited storage time, simplifies the circuit design and saves the cost.
Description
technical field [0001] The technical solution to be protected by the present invention relates to a motor protector and a control method thereof. Background technique [0002] In the power industry, low-voltage motor protectors are used more and more widely. The protector generally has a restart function, that is, according to the time difference between the last power-off time and the power-on again, it is determined whether to automatically start the motor when the power is turned on again. , if the power-off time difference exceeds the set maximum power-off time, the motor will not be started, otherwise the motor will be started automatically. The realization method of this function is generally to detect the power-off moment of the protector through a dedicated chip, and when it is detected that the protector is about to be powered off, an interrupt is generated, and the current time is recorded in the service program of the interrupt, that is, the current time is writte...
Claims
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Inventor 束龙胜刘超宛玉超张全有
Owner ANHUI ZHONGDIAN XINGFA & XINLONG TECH CO LTD