CN202651766U - Single-phase motor protective device - Google Patents
Single-phase motor protective device Download PDFInfo
- Publication number
- CN202651766U CN202651766U CN 201220352837 CN201220352837U CN202651766U CN 202651766 U CN202651766 U CN 202651766U CN 201220352837 CN201220352837 CN 201220352837 CN 201220352837 U CN201220352837 U CN 201220352837U CN 202651766 U CN202651766 U CN 202651766U
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- circuit
- protective device
- current detection
- capacitor
- motor
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Abstract
The utility model relates to a single-phase motor protective device. The single-phase motor protective device comprises a power source circuit, a current detection circuit, a comparator circuit and a single chip microcomputer control circuit, wherein output signals of the power source circuit are transmitted to the current detection circuit, output signals of the current detection circuit are transmitted to the single chip microcomputer control circuit through the comparator circuit, and output signals of the single chip microcomputer control circuit are controlled and transmitted to an RS 485 communication interface circuit and a drive circuit. When a motor overloads, the work power source of the motor is cut off in time, so that the motor is prevented from being burned out, and meanwhile alarm signals are transmitted to an alarm control center through an alarm bus. The single-phase motor protective device has the advantages of being strong in anti-jamming capability, reliable in work performance, low in electricity consumption, and suitable for a small size single-phase alternating-current motor.
Description
Technical field
The utility model relates to a kind of protective device, particularly be a kind of monophase machine protective device.
Background technology
Motor is because of the overweight adstante febre of load, and its operating current will increase, and motor will damage because of overload.
The utility model content
The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of monophase machine protective device is provided.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of monophase machine protective device; comprise power circuit, current detection circuit, comparator circuit and single chip machine controlling circuit; the output signal of described power circuit transfers to current detection circuit; the output signal of described current detection circuit transfers to single chip machine controlling circuit through comparator circuit, and the output signal control of described single chip machine controlling circuit is sent to RS485 communication interface circuit and drive circuit.
Described power circuit is by capacitor C1, C2, resistor R1-R3, rectifier diode D1-D4, voltage stabilizing didoe DW and power supply indication light diode (LED) form, the ac voltage signal at L1, N two ends is successively after capacitor C1 step-down, rectifier diode D1-D4 rectification, resistor R3 current limliting, voltage stabilizing didoe DW voltage stabilizing and capacitor C2 filtering, produce direct voltage, its signal also transfers to power supply indication light diode (LED).
Described current detection circuit is by current transformer TA1, resistor R5-R7, voltage stabilizing didoe DW1, capacitor C3 consists of, described current transformer TA1 detects the operating current signal of motor single phase poaer supply inlet wire, and this signal becomes direct voltage after voltage stabilizing didoe VD1 rectification, capacitor C3 filtering.
Described comparator circuit adopts LM358 operational amplifier IC.
Described RS485 communication interface circuit is connected to the PLC controller by SN75176 communication interface chip IC2.
By adopting above-mentioned technical scheme, the beneficial effects of the utility model are: the utility model can be when electromotor overload, in time cut off the working power of motor, prevent that motor from burning, by the warning bus alarm signal is reached the controlling alarm center simultaneously, have that antijamming capability is strong, reliable working performance, from characteristics such as power consumption are low, be applicable to the small-sized single-phase alternating current motor.
Description of drawings
Fig. 1 is frame assumption diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1 and Figure 2; a kind of monophase machine protective device of the present utility model; comprise power circuit 1, current detection circuit 2, comparator circuit 3 and single chip machine controlling circuit 4; the output signal of described power circuit 1 transfers to current detection circuit 2; the output signal of described current detection circuit 2 transfers to single chip machine controlling circuit 4 through comparator circuit 3, and the output signal control of described single chip machine controlling circuit 4 is sent to RS485 communication interface circuit 41 and drive circuit 42.
Described power circuit 1 is by capacitor C1, C2, resistor R1-R3, rectifier diode D1-D4, voltage stabilizing didoe DW and power supply indication light diode (LED) form, the ac voltage signal at L1, N two ends is successively after capacitor C1 step-down, rectifier diode D1-D4 rectification, resistor R3 current limliting, voltage stabilizing didoe DW voltage stabilizing and capacitor C2 filtering, produce direct voltage, for the machine provides working power, its signal also transfers to power supply indication light diode (LED), and power supply indication light diode (LED) is lighted.
Described current detection circuit 2 is by current transformer TA1, resistor R5-R7, voltage stabilizing didoe DW1, capacitor C3 consists of, described current transformer TA1 detects the operating current signal of motor single phase poaer supply inlet wire, this signal is through voltage stabilizing didoe VD1 rectification, become direct voltage after the capacitor C3 filtering, be added in respectively on the normal phase input end of LM358 operational amplifier IC, compare with its accurate voltage of its inverting input, described DC power supply voltage is after resistance R 4 and resistance R 7 dividing potential drops, for the inverting input of LM358 operational amplifier IC and the normal phase input end of IC provide its accurate voltage.
When electric motor normal working, the normal phase input end voltage of LM358 operational amplifier IC is higher than its reference voltage, and the anti-phase input terminal voltage of LM358 operational amplifier IC is lower than reference voltage, and LM358 operational amplifier IC exports high level, this signal is input to the 23rd pin I/O end of single-chip microcomputer IC1, after single-chip microcomputer IC1 judged, the 28th pin of single-chip microcomputer IC1 output high level was through resistance R 8 current limlitings, make transistor VT conducting, make contactor K adhesive, the promotion motor gets electric, motor operation.
When overload appears in motor, the reversed-phase output voltage of LM358 operational amplifier IC will be higher than reference voltage, LM358 operational amplifier IC output low level, this signal is input to the 23rd pin I/O end of single-chip microcomputer IC1, after single-chip microcomputer IC1 judges, and the 28th pin output low level of single-chip microcomputer IC1, make transistor VT cut-off, make contactor K discharge motor dead electricity, motor stall; Another road output connects to form RS485 communication interface circuit 41 by the 1st, 2,3,4 ends of SN75176 communication interface chip IC2 and the 10th, 11,25 ends of single-chip microcomputer IC1, send data-signal by single-chip microcomputer IC1 to SN75176 communication interface chip IC2, change backward PLC through SN75176 communication interface chip IC2 and send alert data information, PLC shows current state, realize the Microcomputer Long-distance Control, have that antijamming capability is strong, reliable working performance, from characteristics such as power consumption are low.
Above-described only is a preferred embodiment of the present utility model, can not limit the scope that the utility model is implemented, and every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.
Claims (5)
1. monophase machine protective device; it is characterized in that: comprise power circuit (1); current detection circuit (2); comparator circuit (3) and single chip machine controlling circuit (4); the output signal of described power circuit (1) transfers to current detection circuit (2); the output signal of described current detection circuit (2) transfers to single chip machine controlling circuit (4) through comparator circuit (3), and the output signal control of described single chip machine controlling circuit (4) is sent to RS485 communication interface circuit (41) and drive circuit (42).
2. monophase machine protective device according to claim 1; it is characterized in that: described power circuit (1) is by capacitor C1, C2; resistor R1-R3; rectifier diode D1-D4; voltage stabilizing didoe DW and power supply indication light diode (LED) form; the ac voltage signal at L1, N two ends is successively after capacitor C1 step-down, rectifier diode D1-D4 rectification, resistor R3 current limliting, voltage stabilizing didoe DW voltage stabilizing and capacitor C2 filtering; produce direct voltage, its signal also transfers to power supply indication light diode (LED).
3. monophase machine protective device according to claim 1 and 2; it is characterized in that: described current detection circuit (2) is by current transformer TA1; resistor R5-R7, voltage stabilizing didoe DW1; capacitor C3 consists of; described current transformer TA1 detects the operating current signal of motor single phase poaer supply inlet wire, and this signal becomes direct voltage after voltage stabilizing didoe VD1 rectification, capacitor C3 filtering.
4. monophase machine protective device according to claim 1 is characterized in that: described comparator circuit (3) employing LM358 operational amplifier IC.
5. monophase machine protective device according to claim 1, it is characterized in that: described RS485 communication interface circuit (41) is connected to the PLC controller by SN75176 communication interface chip IC2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220352837 CN202651766U (en) | 2012-07-20 | 2012-07-20 | Single-phase motor protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220352837 CN202651766U (en) | 2012-07-20 | 2012-07-20 | Single-phase motor protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202651766U true CN202651766U (en) | 2013-01-02 |
Family
ID=47420811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220352837 Expired - Fee Related CN202651766U (en) | 2012-07-20 | 2012-07-20 | Single-phase motor protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202651766U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103948951A (en) * | 2014-05-04 | 2014-07-30 | 佛山市香奈斯香薰厂 | Air purifier and control circuit thereof |
| CN105422549A (en) * | 2015-12-09 | 2016-03-23 | 西安建筑科技大学 | Alarm of hydraulic system |
| CN105634382A (en) * | 2016-03-31 | 2016-06-01 | 广东美的环境电器制造有限公司 | Single-phase alternating current protective circuit, fan and air condition |
| CN105680251A (en) * | 2016-01-15 | 2016-06-15 | 张月妹 | Over-current protection circuit for socket |
-
2012
- 2012-07-20 CN CN 201220352837 patent/CN202651766U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103948951A (en) * | 2014-05-04 | 2014-07-30 | 佛山市香奈斯香薰厂 | Air purifier and control circuit thereof |
| CN105422549A (en) * | 2015-12-09 | 2016-03-23 | 西安建筑科技大学 | Alarm of hydraulic system |
| CN105422549B (en) * | 2015-12-09 | 2017-05-24 | 西安建筑科技大学 | Alarm of hydraulic system |
| CN105680251A (en) * | 2016-01-15 | 2016-06-15 | 张月妹 | Over-current protection circuit for socket |
| CN105634382A (en) * | 2016-03-31 | 2016-06-01 | 广东美的环境电器制造有限公司 | Single-phase alternating current protective circuit, fan and air condition |
| CN105634382B (en) * | 2016-03-31 | 2019-06-14 | 广东美的环境电器制造有限公司 | A kind of load motor protection circuit, fan and air-conditioning |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130102 Termination date: 20130720 |