CN201656440U - Motor protector - Google Patents

Motor protector Download PDF

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Publication number
CN201656440U
CN201656440U CN2009202922094U CN200920292209U CN201656440U CN 201656440 U CN201656440 U CN 201656440U CN 2009202922094 U CN2009202922094 U CN 2009202922094U CN 200920292209 U CN200920292209 U CN 200920292209U CN 201656440 U CN201656440 U CN 201656440U
Authority
CN
China
Prior art keywords
time
motor protector
power
protector
write
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2009202922094U
Other languages
Chinese (zh)
Inventor
束龙胜
刘超
宛玉超
张全有
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Xinlong Electrical Co Ltd
Original Assignee
Anhui Xinlong Electrical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui Xinlong Electrical Co Ltd filed Critical Anhui Xinlong Electrical Co Ltd
Priority to CN2009202922094U priority Critical patent/CN201656440U/en
Application granted granted Critical
Publication of CN201656440U publication Critical patent/CN201656440U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

The utility model discloses a motor protector, which comprises a protector central control unit MCU, and is characterized in that the central control unit MCU is connected with a memory circuit through a bus interface. By adopting the structure and the method, compared with the prior art, an FRAM technology is integrated with the characteristics of an RAM and an ROM: the motor protector has the read-write speed of the RAM and also can keep power failure. When memory chip FM24CL64 write data has no time delay, the FRAM read-write times are infinite in a 3.3V environment, and the data storage time can reach 10 to 45 years. The power-off moment of the motor protector does not need to be detected, and the current time is written into the motor protector only at the intervals of 1 second, so that the time of the power-off moment can be stored, and a large capacitor occupying larger space is also not needed, thereby the problem of storage time limitation is solved, the circuit design is simplified, and the cost is saved.

Description

A kind of motor protector
Technical field
The claimed technical scheme of the utility model relates to a kind of motor protector.
Background technology
In power industry; low-voltage motor protector uses more and more widely; this protector generally has restart function; promptly according to last time power-off time and power on once more between time difference; decision automatic starting motor whether when powering on once more; if the power-off time difference surpasses the maximum power-off time of setting, then inoperative motor, otherwise with automatic starting motor.The implementation method of this function generally is to detect the protector power-cut time by special chip, produces an interruption when detecting protector and be about to cut off the power supply, and notes the current time in the service routine of this interruption, is about to the current time write among the EEPROM.Common EEPROM has erasable number of times restriction, EEPROM can not carry out write operation again after surpassing erasable number of times, and the certain hour of must delaying time between twice write operation generally needs time-delay 5ms to 10ms, and EEPROM just really finishes write operation during this period.So just need a big electric capacity when system cut-off, to provide enough energy supports for system; this electric capacity often occupation space is very big; and to the dependence of the special chip that detects the protector power-cut time than higher; if this chip can not will be about to the MCU that power-off signal sends motor protector to timely, can't really realize this function.How to adopt a kind of simple and reliable method to realize that restart function is the problem that we need solve.
The utility model content
Technical problem to be solved in the utility model is at the deficiencies in the prior art, and a kind of motor protector is provided, make the motor protector restart function realization not only simply but also reliable.
For solving the problems of the technologies described above, the technical solution of the utility model is, a kind of motor protector comprises protector central control unit MCU, it is characterized in that, described central control unit MCU is connected with memory circuitry by bus interface.
Described memory circuitry comprises that memory chip U2, resistance R 5, R4 form, and the bus interface end of memory chip U2 is connected with power vd D by resistance R 5, R4.
The model of described memory chip U2 is FM24CL64.
A kind of motor protector adopts said structure, compared with prior art, and the characteristic of adopted FRAM technological incorporation RAM and ROM: have the read or write speed of RAM, can power down keep again.Memory chip FM24CL64 write data does not have time-delay, and FRAM read-write number of times is unlimited under the 3.3V environment, and the data holding time can reach 10 years~and 45 years.This motor protector need not to detect power-cut time; only needing 1 second of every interval to write the current time to it can preserve the time of power-cut time, has not also needed the big electric capacity that takes up room very much, has solved the problem of storage number of times restriction; and simplified circuit design, provided cost savings.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail,
Fig. 1 is a kind of motor protector electrical block diagram of the utility model.
Embodiment
As shown in Figure 1, a kind of motor protector comprises protector central control unit MCU, and described central control unit MCU is connected with memory circuitry by bus interface.Described memory circuitry comprises that memory chip U2, resistance R 5, R4 form, and the bus interface end of memory chip U2 is connected with power vd D by resistance R 5, R4.Memory chip U2 model is FM24CL64, and 1,2,3 pin are device subaddressing preparation pin; 4 pin are power supply ground; 5,6 pin are the I2C bus interface, and central control unit MCU can read and write data from memory chip U2 by this interface, and these two pins can guarantee like this that by moving 3.3V on resistance R 4 and the resistance R 5 bus communication is normal; 7 pin are the write-protect pin, when this pin can not carry out write operation to memory chip U2 during for high level, when this pin can carry out write operation to memory chip U2 during for low level; 8 pin are the power supply input pin, input voltage+3.3V.
Central control unit MCU only writes the current time to memory chip U2 by the every interval of I2C bus 1 second, and the time that writes comprises year, month, day, hour, min, second, can will work as the time value of power-cut time like this and also preserve.When powering on once more; central control unit MCU compares the time of memory chip U2 preservation and current time; computing time, whether difference surpassed maximum power-off time; then keep dead ship condition if surpass maximum power-off time; otherwise, realized the restart function of low-voltage motor protector with automatic starting motor.
FRAM (ferroelectric storage) technological incorporation the characteristic of RAM and ROM: have the read or write speed of RAM, can power down keep again.FRAM family chip write data does not have time-delay, and FRAM read-write number of times is unlimited under the 3.3V environment, and the data holding time can reach 10 years~and 45 years.The memory chip U2 that adopts the FRAM technology to produce just need not to use outage detection special chip and big electric capacity, and FM24CL64 is exactly the memory that adopts the FRAM technology, directly replaces original EEPROM with it and gets final product.What central control unit MCU adopted is ARM series 3.3V system (model is LPC2136), FM24CL64 read-write number of times is unlimited under the 3.3V environment, need not to detect power-cut time like this, only needing 1 second of every interval to write the current time to it can preserve the time of power-cut time, has not also needed the big electric capacity that takes up room very much.
In conjunction with the accompanying drawings the utility model has been carried out exemplary description above; obviously the utility model specific implementation is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted method design of the present utility model and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection range of the present utility model.

Claims (3)

1. a motor protector comprises protector central control unit MCU, it is characterized in that, described central control unit MCU is connected with memory circuitry by bus interface.
2. according to the described a kind of motor protector of claim 1, it is characterized in that described memory circuitry comprises that memory chip U2, resistance R 5, R4 form, the bus interface end of memory chip U2 is connected with power vd D by resistance R 5, R4.
3. according to the described a kind of motor protector of claim 1, it is characterized in that the model of described memory chip U2 is FM24CL64.
CN2009202922094U 2009-12-12 2009-12-12 Motor protector Expired - Fee Related CN201656440U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009202922094U CN201656440U (en) 2009-12-12 2009-12-12 Motor protector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009202922094U CN201656440U (en) 2009-12-12 2009-12-12 Motor protector

Publications (1)

Publication Number Publication Date
CN201656440U true CN201656440U (en) 2010-11-24

Family

ID=43121678

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009202922094U Expired - Fee Related CN201656440U (en) 2009-12-12 2009-12-12 Motor protector

Country Status (1)

Country Link
CN (1) CN201656440U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101714754B (en) * 2009-12-12 2011-11-09 安徽鑫龙电器股份有限公司 Electric motor protector and control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101714754B (en) * 2009-12-12 2011-11-09 安徽鑫龙电器股份有限公司 Electric motor protector and control method thereof

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
EE01 Entry into force of recordation of patent licensing contract

Assignee: Anhui Xin Long SBLV

Assignor: Xinlong Electric-Appliance Co., Ltd., Anhui

Contract record no.: 2011340000219

Denomination of utility model: Electromotor protector

Granted publication date: 20101124

License type: Exclusive License

Record date: 20110729

C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20101124

Termination date: 20131212