CN209860580U - Intelligent motor protector - Google Patents
Intelligent motor protector Download PDFInfo
- Publication number
- CN209860580U CN209860580U CN201920877914.4U CN201920877914U CN209860580U CN 209860580 U CN209860580 U CN 209860580U CN 201920877914 U CN201920877914 U CN 201920877914U CN 209860580 U CN209860580 U CN 209860580U
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- China
- Prior art keywords
- motor
- circuit
- field effect
- relay
- chip microcomputer
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Abstract
The utility model relates to a motor protection device, concretely relates to intelligent motor protector, including controller, motor drive circuit, ADC sampling circuit and step-down gate circuit, ADC sampling circuit connects the controller, and the controller connects step-down gate circuit, motor drive circuit, and step-down gate circuit connects motor drive circuit, and motor drive circuit connects the motor; the utility model provides a technical scheme can effectively overcome the circuit structure complicacy that prior art exists, the relatively poor defect of monitoring effect.
Description
Technical Field
The utility model relates to a motor protection device, concretely relates to intelligent motor protector.
Background
Along with the development of a power distribution system, in order to ensure the safe and stable operation of a motor of a low-voltage power supply and distribution system and prevent the motor from being burnt or causing major safety accidents in use, intelligent motor protectors are required to be installed on a motor power distribution loop of the low-voltage power distribution system. The existing motor protector mainly takes a single chip microcomputer as a microcontroller, and can realize intelligent comprehensive protection of a motor. The motor protector calculates the current and voltage signal data collected by the front end, judges and processes multiple faults such as overcurrent, phase loss, locked rotor, overload, electric leakage, overvoltage, undervoltage, unbalance degree and the like according to the calculated real-time data, protects and gives out a fault to the motor, has a remote communication function, and can realize online monitoring on multiple networked motor protectors through a monitoring system.
At present, a three-phase current transformer is generally used for amplifying, detecting, delaying, adjusting and executing a relay to protect a motor, an induced current is firstly detected to be out of phase or larger than a preset value through the current transformer, and the induced current is amplified through an amplifier to drive the relay.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
To the above-mentioned shortcoming that prior art exists, the utility model provides an intelligent motor protector can effectively overcome the circuit structure complicacy that prior art exists, the relatively poor defect of monitoring effect.
(II) technical scheme
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
the intelligent motor protector comprises a controller, a motor driving circuit, an ADC (analog to digital converter) sampling circuit and a voltage reduction gating circuit, wherein the ADC sampling circuit is connected with the controller, the controller is connected with the voltage reduction gating circuit and the motor driving circuit, the voltage reduction gating circuit is connected with the motor driving circuit, and the motor driving circuit is connected with a motor;
the ADC sampling circuit is used for sampling the running current of the motor, converting the running current into a digital signal and inputting the digital signal into the controller;
the controller is used for selecting normal operation, voltage reduction operation or stop operation according to the motor operation current, the voltage reduction operation is realized through the voltage reduction gating circuit, and the stop operation is realized by cutting off the input of the motor driving circuit through the controller.
Preferably, the controller adopts a single chip microcomputer, the motor driving circuit adopts a field effect transistor, a motor driving IO interface of the single chip microcomputer is connected with a grid electrode of the field effect transistor, and a drain electrode of the field effect transistor forms a loop with the motor through the voltage reduction gating circuit.
Preferably, the step-down gating circuit adopts a relay, the control end of the relay is respectively connected with a 12V power supply and a gating control signal, and the gating control signal is output by the single chip microcomputer;
the common end of the relay is connected with the motor, the normally closed contact of the relay is connected with the drain electrode of the field effect transistor, and the normally open contact of the relay is connected with the 12V power supply.
Preferably, a motor drive IO interface of the single chip microcomputer is connected to a gate of the field effect transistor through a triode, and the IO interface of the single chip microcomputer, which outputs a gating control signal, is connected to the relay control terminal through the triode.
Preferably, a 12V power supply is adopted, the power supply is connected with an input protection circuit, the input protection circuit consists of a rectifier bridge GBU810 and a fast recovery diode RHRP3060, and the fast recovery diode RHRP3060 is connected between the drain electrode of the field effect tube and the 12V power supply.
Preferably, the ADC sampling circuit is composed of an operational amplifier AD8651 and a peripheral circuit thereof, a drain of the field effect transistor is connected to a same-direction input end of the operational amplifier AD8651, and an output end of the operational amplifier AD8651 is connected to the single chip microcomputer.
(III) advantageous effects
Compared with the prior art, the utility model provides an intelligent motor protector adopts the singlechip to control the coil circuit of relay, the working circuit of relay connects at two motor output pin, when external input control signal, the singlechip is received and is made corresponding action through the IO mouth, one of them output 12V voltage of two relays of control, another relay is out of work, just so can control the mode of motor through the outside, if want whole return circuit to switch on, must make the field effect transistor who is controlled by the singlechip to switch on, under motor operating condition, the current of ADC sampling circuit sampling external input voltage and field effect transistor monitors the motor and whether goes wrong at the during operation, and then play the effect of protection motor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a pin structure diagram of the single chip microcomputer U2 of the present invention;
FIG. 2 is a schematic diagram of the power circuit structure of the present invention;
fig. 3 is a schematic diagram of the connection between the motor driving circuit and the single chip microcomputer U2;
fig. 4 is a schematic diagram of the structure of the motor driving circuit of the present invention;
fig. 5 is a schematic diagram of the structure of the motor protection circuit of the present invention;
FIG. 6 is a schematic view of the FET of FIG. 5 connected to a single-chip microcomputer U2 according to the present invention;
fig. 7 is a schematic diagram of the ADC sampling circuit of the present invention;
fig. 8 is a schematic diagram of the circuit structure for detecting external level change of the single chip microcomputer U2;
fig. 9 is a schematic circuit diagram of the download port SWD1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The intelligent motor protector comprises a controller, a motor driving circuit, an ADC (analog to digital converter) sampling circuit and a voltage reduction gating circuit, wherein the ADC sampling circuit is connected with the controller, the controller is connected with the voltage reduction gating circuit and the motor driving circuit, the voltage reduction gating circuit is connected with the motor driving circuit, and the motor driving circuit is connected with a motor;
the ADC sampling circuit is used for sampling the running current of the motor and converting the running current into a digital signal to be input into the controller;
the controller is used for selecting normal operation, voltage reduction operation or stop operation according to the motor operation current, the voltage reduction operation is realized through the voltage reduction gating circuit, and the stop operation is realized by cutting off the input of the motor driving circuit through the controller.
The controller adopts a singlechip, the motor drive circuit adopts a field effect tube, a motor drive IO interface of the singlechip is connected with a grid electrode of the field effect tube, and a drain electrode of the field effect tube forms a loop with the motor through a voltage reduction gating circuit.
The voltage reduction gating circuit adopts a relay, the control end of the relay is respectively connected with a 12V power supply and a gating control signal, and the gating control signal is output by the singlechip;
the common end of the relay is connected with the motor, the normally closed contact of the relay is connected with the drain electrode of the field effect transistor, and the normally open contact of the relay is connected with the 12V power supply.
The motor drive IO interface of singlechip passes through the triode and connects the grid of field effect transistor, and the IO interface that singlechip output gating control signal passes through the triode and inserts the relay control end.
A12V power supply is adopted and connected with an input protection circuit, the input protection circuit consists of a rectifier bridge GBU810 and a fast recovery diode RHRP3060, and the fast recovery diode RHRP3060 is connected between the drain electrode of the field effect transistor and the 12V power supply.
The ADC sampling circuit is composed of an operational amplifier AD8651 and a peripheral circuit thereof, the drain electrode of the field effect tube is connected with the homodromous input end of the operational amplifier AD8651, and the output end of the operational amplifier AD8651 is connected with the single chip microcomputer.
The power supply circuit comprises a chip U3, and the chip U3 converts 12V input voltage into 3.3V output voltage to be supplied to the singlechip U2. A pin 3 of the chip U3 is connected with 12V input voltage through a resistor R19 and a diode D9, a capacitor C12, a capacitor C14 and a diode D10 are connected between a pin 1 and a pin 3 of the chip U3, a pin 2 of the chip U3 outputs 3.3V output voltage, and the chip U3 is a REG1117-3.3 chip.
The motor driving circuit comprises two relays J5 and J6, a control pin 8 of the relay J5 and a control pin 4 of the relay J6 are connected to the single chip microcomputer U2 through a triode and a current-limiting resistor.
A control pin 8 of the relay J5 is connected to a collector of a triode Q2, a base of the triode Q2 is connected to a singlechip U2 through a current-limiting resistor R17, a control pin 4 of the relay J6 is connected to a collector of a triode Q1, and a base of the triode Q1 is connected to a singlechip U2 through a current-limiting resistor R16.
Relay J5, J6 include normally open contact, normally closed contact, static contact, and normally open contact includes that pin 1, pin 2, pin 3 insert 12V input voltage, and normally closed contact includes pin 5, pin 6, pin 7 ground connection, and static contact includes that pin 9, pin 10, pin 11 insert the motor output.
The motor driving circuit adopts a field effect transistor which is connected to the singlechip U2 through a triode control circuit. A grid pin 1 of the field effect transistor is connected with a collector of a triode Q3, the collector of the triode Q3 is connected with 12V input voltage through a resistor R18, a base of the triode Q3 is connected with a single chip microcomputer U2 through a resistor R20, and the field effect transistor is HA210N 06.
Pin 1 of the rectifier bridge J4 is connected to 12V input voltage, and the drain pin 2 of the fet is connected to 12V input voltage through the fast recovery rectifier diode D6, where the fast recovery rectifier diode D6 is RHRP 3060.
The ADC sampling circuit comprises an operational amplifier U1, a homodromous input end Q1 of an operational amplifier U1 is connected with the drain electrode of a field effect transistor, and an operational amplifier U1 is connected with the divided voltage of 12V input voltage. The ADC sampling circuit achieves real-time monitoring whether the input voltage value changes or not by sampling 12V power supply voltage, can sample the current of the field effect transistor HA210N06 to achieve under-voltage and over-voltage protection, and if the current is too large, the voltage is reduced, and even the power supply is turned off.
Pins PB5, PB6 and PB7 of the single chip microcomputer U2 are connected to indicator lamps LED1, LED2 and LED3 through resistors R11, R12 and R13 respectively. The single chip microcomputer U2 controls the working mode of the motor through an IO pin and enables the corresponding indicator light to be turned on.
As shown in fig. 8, the single chip microcomputer U2 accesses four external inputs through diodes D1, D2, D3, and D4 to detect external level changes, so that the single chip microcomputer U2 can perform corresponding actions.
As shown in fig. 9, the SWDCLK interface of the single chip microcomputer U2 is connected to the download port SWD1 for the single chip microcomputer U2 to download programs, the single chip microcomputer U2 is STM32F103C8T6, and the download port SWD1 is used for the single chip microcomputer U2 to download programs.
After a grid pin 1 of the field effect transistor is conducted by a control pin of the single-chip microcomputer U2, a drain pin 2 of the field effect transistor inputs voltage to normally closed contact pins 5, 6 and 7 of the relays J5 and J6, so that the normally closed contact pins 5, 6 and 7 of the relays J5 and J6 and the normally open contact pins 1, 2 and 3 are all 12V.
The singlechip U2 does not input signals to the grid pin 1 of the field effect transistor, the field effect transistor is not conducted, the voltages of the normally closed contact pins 5, 6 and 7 of the relays J5 and J6 are 0, namely the singlechip U2 can output 12V voltage through controlling the pins to gate the normally open contact pins 1, 2 and 3 or the normally closed contact pins 5, 6 and 7 of the relays J5 and J6, and the other one does not work, so that the working mode of the motor can be controlled through the outside.
When the ADC sampling circuit detects that the current of the field effect transistor is too large, the single chip microcomputer U2 does not input signals to a grid electrode pin 1 of the field effect transistor, the field effect transistor is not conducted, and the single chip microcomputer U2 gates normally closed contact pins 5, 6 and 7 of the relays J5 and J6 through control pins, so that the motor does not work, and the motor can be protected.
The utility model provides an intelligent motor protector adopts the singlechip to control the coil circuit of relay, the working circuit of relay connects at two motor output pins, when external input control signal, the singlechip is received and is made corresponding action through the IO mouth, control one of them output 12V voltage of two relays, another relay is out of work, just so can control the mode of motor through the outside, if want whole return circuit to switch on, must make the field effect transistor that is controlled by the singlechip to switch on, under motor operating condition, the current of ADC sampling circuit sampling external input voltage and field effect transistor monitors the motor and whether goes wrong at the during operation, and then play the effect of protection motor.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (6)
1. Intelligent motor protector, its characterized in that: the sampling circuit of the ADC is connected with the controller, the controller is connected with the step-down gating circuit and the motor driving circuit, the step-down gating circuit is connected with the motor driving circuit, and the motor driving circuit is connected with the motor;
the ADC sampling circuit is used for sampling the running current of the motor, converting the running current into a digital signal and inputting the digital signal into the controller;
the controller is used for selecting normal operation, voltage reduction operation or stop operation according to the motor operation current, the voltage reduction operation is realized through the voltage reduction gating circuit, and the stop operation is realized by cutting off the input of the motor driving circuit through the controller.
2. The intelligent motor protector of claim 1 wherein: the controller adopts a single chip microcomputer, the motor driving circuit adopts a field effect tube, a motor driving IO interface of the single chip microcomputer is connected with a grid electrode of the field effect tube, and a drain electrode of the field effect tube forms a loop with the motor through the voltage reduction gating circuit.
3. The intelligent motor protector of claim 2, wherein: the voltage reduction gating circuit adopts a relay, the control end of the relay is respectively connected with a 12V power supply and a gating control signal, and the gating control signal is output by the single chip microcomputer;
the common end of the relay is connected with the motor, the normally closed contact of the relay is connected with the drain electrode of the field effect transistor, and the normally open contact of the relay is connected with the 12V power supply.
4. The intelligent motor protector of claim 3 wherein: the motor drive IO interface of the single chip microcomputer is connected with the grid electrode of the field effect transistor through a triode, and the IO interface of the single chip microcomputer, which outputs a gating control signal, is connected to the relay control end through the triode.
5. An intelligent motor protector according to any one of claims 2-4 wherein: A12V power supply is adopted and connected with an input protection circuit, the input protection circuit is composed of a rectifier bridge GBU810 and a fast recovery diode RHRP3060, and the fast recovery diode RHRP3060 is connected between the drain electrode of the field effect tube and the 12V power supply.
6. The intelligent motor protector of claim 5 wherein: the ADC sampling circuit is composed of an operational amplifier AD8651 and a peripheral circuit thereof, the drain electrode of the field effect tube is connected to the same-direction input end of the operational amplifier AD8651, and the output end of the operational amplifier AD8651 is connected to the single chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920877914.4U CN209860580U (en) | 2019-06-12 | 2019-06-12 | Intelligent motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920877914.4U CN209860580U (en) | 2019-06-12 | 2019-06-12 | Intelligent motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209860580U true CN209860580U (en) | 2019-12-27 |
Family
ID=68942135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920877914.4U Expired - Fee Related CN209860580U (en) | 2019-06-12 | 2019-06-12 | Intelligent motor protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209860580U (en) |
-
2019
- 2019-06-12 CN CN201920877914.4U patent/CN209860580U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191227 Termination date: 20200612 |
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| CF01 | Termination of patent right due to non-payment of annual fee |