CN105004902A - Motor voltage detection circuit - Google Patents
Motor voltage detection circuit Download PDFInfo
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- CN105004902A CN105004902A CN201510394800.0A CN201510394800A CN105004902A CN 105004902 A CN105004902 A CN 105004902A CN 201510394800 A CN201510394800 A CN 201510394800A CN 105004902 A CN105004902 A CN 105004902A
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- operational amplifier
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Abstract
The invention belongs to the technical field of motor voltage detection and provides a motor voltage detection circuit. The motor voltage detection circuit comprises a voltage input end, a voltage output end, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a first operational amplifier, a second operational amplifier and a protection circuit. The voltage input end is connected with a non-inverting input end of the first operational amplifier through the first resistor and the second resistor. An inverting input end of the first operational amplifier is connected with an output end of the first operational amplifier through the third resistor. An output end of the first operational amplifier is connected with a non-inverting input end of the second operational amplifier. An inverting input end of the second operational amplifier is connected with an output end of the second operational amplifier. An output end of the second operational amplifier is connected with the voltage output end through the fourth resistor. The motor voltage detection circuit is good in stability and is capable of detecting a motor voltage in real time.
Description
Technical field
The invention belongs to electric moter voltage detection technique field, relate to a kind of electric moter voltage testing circuit.
Background technology
Electric moter voltage testing circuit is usually used in preventing the appearance voltage of motor operationally in circuit excessive or cause the situation of motor damage to occur due to the fluctuation of voltage.Voltage output end in electric moter voltage testing circuit is connected with data processing end, reaches the effect of the voltage detecting motor in real time, thus is also provided with the effect to motor real-time guard.
The general stability of motor protective circuit of current use is not enough, does not possess the ability detecting electric moter voltage in real time; Motor protective circuit does not have the damage that effect causes motor, and the cost of maintenance motor is high, and workload is large, and the normal operation of influential system.
Summary of the invention
The object of the invention is to there are the problems referred to above for existing technology, the electric moter voltage testing circuit propose a kind of good stability, electric moter voltage can being measured in real time, motor can be protected.
Object of the present invention realizes by following technical proposal: a kind of electric moter voltage testing circuit, and described electric moter voltage testing circuit comprises voltage input end, voltage output end, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the first electric capacity C1, the first operational amplifier U1, the second operational amplifier U2, protection circuit; Described voltage input end connects the in-phase input end of the first operational amplifier U1 through the first resistance R1, the second resistance R2, and the inverting input of described first operational amplifier U1 is connected with the output terminal of the first operational amplifier U1 through the 3rd resistance R3; The output terminal of described first operational amplifier U1 is connected with the in-phase input end of the second operational amplifier U2, the inverting input of the second operational amplifier U2 is connected with the output terminal of the second operational amplifier U2, the output terminal of described second operational amplifier U2 is connected with voltage output end through the 4th resistance R4, one end first electric capacity C1 ground connection that described 4th resistance R4 is connected with voltage output end.
In above-mentioned a kind of electric moter voltage testing circuit, described protection circuit comprises the first voltage source, the second voltage source, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the second electric capacity C2, the 3rd electric capacity C3, the first diode D1 to the 4th diode D4; One end of described 5th resistance R5 is connected with the in-phase input end of the first operational amplifier U1, the other end ground connection of the 5th resistance R5, described 5th resistance R5 is also connected with the anode of the first diode D1, the negative electrode of described first diode D1 is connected with the anode of the second diode D2, the negative electrode of the second diode D2 is connected with the first voltage source, and described second electric capacity C2 is in parallel with the 5th resistance R5; One end of described 7th resistance R7 is connected with the inverting input of the first operational amplifier U1, the other end of the 7th resistance R7 is through the 6th resistance R6 ground connection, one end of described 3rd electric capacity C3 is connected with the inverting input of the first operational amplifier U1, the other end ground connection of the 3rd electric capacity C3, described 3rd electric capacity C3 is also connected with the anode of the 3rd diode D3, the negative electrode of described 3rd diode D3 is connected with the anode of the 4th diode D4, and the negative electrode of described 4th diode D4 connects the second voltage source.
In above-mentioned a kind of electric moter voltage testing circuit, described electrode voltage testing circuit also comprises tertiary voltage source, the 4th voltage source, the 4th electric capacity C4, the 5th electric capacity C5; Described second operational amplifier is also connected with tertiary voltage source, the 4th voltage source.
In above-mentioned a kind of electric moter voltage testing circuit, described tertiary voltage source the 5th electric capacity C5 ground connection, described 4th voltage source is through the 4th electric capacity C4 ground connection.
The course of work of the present invention is as follows: voltage input end connects the U phase of three phase electric machine, voltage enters circuit through voltage input end, the first operational amplifier U1 is exported to after the first resistance R1, the second resistance R2 dividing potential drop, voltage exports to the second operational amplifier U2 through output terminal after the first operational amplifier U1 amplifies, the enlargement factor of the second operational amplifier U2 is approximately 1 times, and voltage exports to voltage output end after the second operational amplifier U2 finely tunes.Second operational amplifier U2 plays the effect of voltage follower, the input of isolation voltage and output two parts, at voltage through the second operational amplifier U2, the input of adjustment voltage and output impedance, isolation voltage exports the impact between front stage, and plays the effect of buffering.Voltage output end is connected with data processing end, can calculate electric moter voltage in real time.The acting as of protection circuit prevents from peak voltage from entering in motor circuit causing component damage.
Compared with prior art, beneficial effect of the present invention is: the present invention using operational amplifier as core, and comprises the protection circuit of Diode series formation, substantially increases the protective capability of the present invention for motor.Voltage output end of the present invention is connected with data processing end, detects the voltage of motor in real time, thus can reach the real-time guard for motor.
Accompanying drawing explanation
Fig. 1 be electric moter voltage testing circuit circuit diagram.
Embodiment
Be below specific embodiments of the invention and by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1, this electric moter voltage testing circuit comprises voltage input end, voltage output end, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the first electric capacity C1, the first operational amplifier U1, the second operational amplifier U2, protection circuit; Described voltage input end connects the in-phase input end of the first operational amplifier U1 through the first resistance R1, the second resistance R2, and the inverting input of described first operational amplifier U1 is connected with the output terminal of the first operational amplifier U1 through the 3rd resistance R3; The output terminal of described first operational amplifier U1 is connected with the in-phase input end of the second operational amplifier U2, the inverting input of the second operational amplifier U2 is connected with the output terminal of the second operational amplifier U2, the output terminal of described second operational amplifier U2 is connected with voltage output end through the 4th resistance R4, one end first electric capacity C1 ground connection that described 4th resistance R4 is connected with voltage output end.
In above-mentioned electric moter voltage testing circuit, described protection circuit comprises the first voltage source, the second voltage source, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the second electric capacity C2, the 3rd electric capacity C3, the first diode D1 to the 4th diode D4; One end of described 5th resistance R5 is connected with the in-phase input end of the first operational amplifier U1, the other end ground connection of the 5th resistance R5, described 5th resistance R5 is also connected with the anode of the first diode D1, the negative electrode of described first diode D1 is connected with the anode of the second diode D2, the negative electrode of the second diode D2 is connected with the first voltage source, and described second electric capacity C2 is in parallel with the 5th resistance R5; One end of described 7th resistance R7 is connected with the inverting input of the first operational amplifier U1, the other end of the 7th resistance R7 is through the 6th resistance R6 ground connection, one end of described 3rd electric capacity C3 is connected with the inverting input of the first operational amplifier U1, the other end ground connection of the 3rd electric capacity C3, described 3rd electric capacity C3 is also connected with the anode of the 3rd diode D3, the negative electrode of described 3rd diode D3 is connected with the anode of the 4th diode D4, and the negative electrode of described 4th diode D4 connects the second voltage source.
In above-mentioned a kind of electric moter voltage testing circuit, described electrode voltage testing circuit also comprises tertiary voltage source, the 4th voltage source, the 4th electric capacity C4, the 5th electric capacity C5; Described second operational amplifier is also connected with tertiary voltage source, the 4th voltage source.
In above-mentioned a kind of electric moter voltage testing circuit, described tertiary voltage source the 5th electric capacity C5 ground connection, described 4th voltage source is through the 4th electric capacity C4 ground connection.
Voltage enters circuit through voltage input end, the in-phase input end of the first operational amplifier U1 is exported to after the first resistance R1, the second resistance R2, after the amplification of the first operational amplifier U1, export to the in-phase input end of the second operational amplifier U2 through the output terminal of the first operational amplifier U1, voltage feeds back to the inverting input of the first operational amplifier U1 through the 3rd resistance R3 through the output terminal of the first operational amplifier U1.The enlargement factor of the second operational amplifier U2 is approximately 1 times, second operational amplifier U2 plays the effect of voltage follower, the input of isolation voltage and output two parts, namely isolate the first operational amplifier U1 and voltage output end, prevent voltage voltage unstable after the amplification through the first operational amplifier U1 from directly exporting to voltage output end and cause component damage; At voltage through the second operational amplifier U2, second operational amplifier U2 proposes high-tension input impedance, reduce the output impedance of voltage, second operational amplifier U2 is open circuit relative to voltage input end, second operational amplifier U2 is stable voltage source relative to the 4th resistance R4 and voltage output end, reach the effect that isolation voltage exports the impact between front stage like this, and play the effect of voltage buffer.When voltage exports to voltage output end through the 4th resistance R4 after the second operational amplifier U2 finely tunes, voltage exports through voltage output end.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (4)
1. an electric moter voltage testing circuit, it is characterized in that, described electric moter voltage testing circuit comprises voltage input end, voltage output end, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first electric capacity, the first operational amplifier, the second operational amplifier, protection circuit; Described voltage input end connects the in-phase input end of the first operational amplifier through the first resistance, the second resistance, and the inverting input of described first operational amplifier is connected with the output terminal of the first operational amplifier through the 3rd resistance; The output terminal of described first operational amplifier is connected with the in-phase input end of the second operational amplifier, the inverting input of the second operational amplifier is connected with the output terminal of the second operational amplifier, the output terminal of described second operational amplifier is connected with voltage output end through the 4th resistance, one end first capacity earth that described 4th resistance is connected with voltage output end.
2. a kind of electric moter voltage testing circuit according to claim 1, it is characterized in that, described protection circuit comprises the first voltage source, the second voltage source, the 5th resistance, the 6th resistance, the 7th resistance, the second electric capacity, the 3rd electric capacity, the first diode to the 4th diode; One end of described 5th resistance is connected with the in-phase input end of the first operational amplifier, the other end ground connection of the 5th resistance, described 5th resistance is also connected with the anode of the first diode, the negative electrode of described first diode is connected with the anode of the second diode, the negative electrode of the second diode is connected with the first voltage source, described second electric capacity and the 5th resistor coupled in parallel; One end of described 7th resistance is connected with the inverting input of the first operational amplifier, the other end of the 7th resistance is through the 6th resistance eutral grounding, one end of described 3rd electric capacity is connected with the inverting input of the first operational amplifier, the other end ground connection of the 3rd electric capacity, described 3rd electric capacity is also connected with the anode of the 3rd diode, the negative electrode of described 3rd diode is connected with the anode of the 4th diode, and the negative electrode of described 4th diode connects the second voltage source.
3. a kind of electric moter voltage testing circuit according to claim 1, is characterized in that, described electrode voltage testing circuit also comprises tertiary voltage source, the 4th voltage source, the 4th electric capacity, the 5th electric capacity; Described second operational amplifier is also connected with tertiary voltage source, the 4th voltage source.
4. a kind of electric moter voltage testing circuit according to claim 3, is characterized in that, described tertiary voltage source the 5th capacity earth, described 4th voltage source is through the 4th capacity earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510394800.0A CN105004902A (en) | 2015-07-03 | 2015-07-03 | Motor voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510394800.0A CN105004902A (en) | 2015-07-03 | 2015-07-03 | Motor voltage detection circuit |
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| CN105004902A true CN105004902A (en) | 2015-10-28 |
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| CN201510394800.0A Pending CN105004902A (en) | 2015-07-03 | 2015-07-03 | Motor voltage detection circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472317A (en) * | 2013-08-22 | 2013-12-25 | 广东美芝制冷设备有限公司 | Open-phase detection circuit of three-phase variable-frequency electromotor |
| CN203416165U (en) * | 2013-08-07 | 2014-01-29 | 宁波兴泰机械有限公司 | Power supply circuit of servo driver |
| CN204731302U (en) * | 2015-07-03 | 2015-10-28 | 宁波兴泰机械有限公司 | A kind of electric moter voltage testing circuit |
-
2015
- 2015-07-03 CN CN201510394800.0A patent/CN105004902A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203416165U (en) * | 2013-08-07 | 2014-01-29 | 宁波兴泰机械有限公司 | Power supply circuit of servo driver |
| CN103472317A (en) * | 2013-08-22 | 2013-12-25 | 广东美芝制冷设备有限公司 | Open-phase detection circuit of three-phase variable-frequency electromotor |
| CN204731302U (en) * | 2015-07-03 | 2015-10-28 | 宁波兴泰机械有限公司 | A kind of electric moter voltage testing circuit |
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Address after: 315111 five Town Industrial Zone, Ningbo, Zhejiang, Yinzhou District Applicant after: Ningbo Xingtai Technology Co., Ltd. Address before: 315111 Zhejiang city of Ningbo province Yinzhou District Wuxiang Industrial Park Xin Shui Road No. 6 Applicant before: Ningbo Xingtai Machinery Co., Ltd. |
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Application publication date: 20151028 |
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| RJ01 | Rejection of invention patent application after publication |