CN205356197U - Circuit for preventing power source protection caused by overlarge motor starting surge currents - Google Patents
Circuit for preventing power source protection caused by overlarge motor starting surge currents Download PDFInfo
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- CN205356197U CN205356197U CN201620139136.5U CN201620139136U CN205356197U CN 205356197 U CN205356197 U CN 205356197U CN 201620139136 U CN201620139136 U CN 201620139136U CN 205356197 U CN205356197 U CN 205356197U
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- amplifier
- circuit
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- outfan
- voltage
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Abstract
The utility model provides a circuit for preventing power source protection caused by overlarge motor starting surge currents, it includes: the current sensor, voltage follower circuit, the accurate rectifier circuit that connect gradually, accurate rectifier circuit is connected with voltage comparater's reverse input end, voltage comparater's non inverting input end is through first ohmic connection to threshold values reference voltage ware, through the output of second ohmic connection to voltage comparater, voltage comparater's output still is connected with IGBT drive circuit and MCU respectively through third ohmic connection to circuit power supply, voltage comparater's output. When the motor starts, the warp the utility model discloses afterwards, impulse current can restrict the within range that can bear at IGBT, and before MCU closed the power and reports to the police, the motor can finish the start -up course and get into normal operating state to not only the motor has been started but also protected IGBT.
Description
Technical field
This utility model relates to power technique fields, particularly relates to a kind of circuit preventing electric motor starting dash current from causing power protection.
Background technology
The protection circuit of existing power supply exports when electric current reaches protection threshold values can protect immediately at IGBT; stop output; but motor electric current when starting is very big; therefore it is well over IGBT and exports the protection threshold values of electric current; thus result in motor just to start; power supply just protects, it is impossible to normally use, if changing powerful IGBT can increase cost.
Utility model content
This utility model provides a kind of circuit preventing electric motor starting dash current from causing power protection, it is not necessary to changes high-power IGBT and just has the advantage preventing electric motor starting dash current from causing power protection.
This utility model is to be achieved through the following technical solutions:
A kind of circuit preventing electric motor starting dash current from causing power protection, comprising: the current sensor being sequentially connected with, voltage follower circuit, precise rectification circuit；
Precise rectification circuit is connected with the reverse input end of voltage comparator；The in-phase input end of voltage comparator is connected to threshold criteria voltage device through the first resistance, is connected to the outfan of voltage comparator through the second resistance；The outfan of voltage comparator is connected to circuit power through the 3rd resistance, and the outfan of voltage comparator is also connected with IGBT drive circuit and MCU respectively.
Further, voltage follower circuit includes the first amplifier, the inverting input of the first amplifier is connected to current sensor by the 4th resistance, the in-phase input end of the first amplifier is connected to circuit ground by the 6th resistance, the outfan of the first amplifier is connected to precise rectification circuit, and is also associated with the 5th resistance between the inverting input of the first amplifier and outfan.
Further, precise rectification circuit includes: the second amplifier and the 3rd amplifier, the inverting input of the second amplifier is connected to voltage follower circuit through the 7th resistance, and the inverting input of the second amplifier is connected to the reverse input end of the 3rd amplifier through the 7th resistance and the tenth resistance；The in-phase input end of the second amplifier is connected to power supply ground through the 8th resistance；The outfan of the second amplifier and the anode of the first diode connect, and the negative electrode of the first diode is connected to the inverting input of the second amplifier；The outfan of the second amplifier and the negative electrode of the second diode connect, and the anode of the second diode is connected to the reverse input end of the second amplifier through the 9th resistance, is connected to the inverting input of the 3rd amplifier through the 11st resistance respectively；The normal phase input end of the 3rd amplifier is connected to power supply ground through the 13rd resistance (R13)；The inverting input of the 3rd amplifier is connected to the outfan of the 3rd amplifier through the 12nd resistance, and the outfan of the 3rd amplifier is connected to the inverting input of described voltage comparator.
Compared with prior art, the beneficial effects of the utility model are:
When the motor is energized, after this utility model, dash current may be limited in the IGBT scope that can bear, and before MCU closes power supply and reports to the police, motor can terminate start-up course and enter normal operating condition, thus not only starting motor but also protect IGBT.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model；
Fig. 2 is the schematic diagram of voltage follower circuit of the present utility model；
Fig. 3 is the schematic diagram of precise rectification circuit of the present utility model.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain this utility model, be not used to limit this utility model.
As it is shown in figure 1, a kind of circuit preventing electric motor starting dash current from causing power protection, comprising: the current sensor 1 being sequentially connected with, voltage follower circuit 2, precise rectification circuit 3；Precise rectification circuit 3 is connected with the reverse input end of voltage comparator U1；The in-phase input end of voltage comparator U1 is connected to threshold criteria voltage device 4 through the first resistance R1, is connected to the outfan of voltage comparator U1 through the second resistance R2；The outfan of voltage comparator U1 is connected to circuit power VCC through the 3rd resistance R3, and the outfan of voltage comparator U1 is also connected with IGBT drive circuit 5 and MCU6 respectively.
Wherein, current sensor 1 is responsible for current signal being changed into voltage signal and isolating with major loop, and its output signal gives voltage follower 2；Voltage follower circuit 2 improves input impedance thus the linearity improving signal reduces wave distortion, and its output signal gives precise rectification circuit 3；Precise rectification circuit 3 overturns the negative half period of AC signal, and its output signal gives the reverse input end of voltage comparator U1.
Output electric current is by current sensor 1, voltage follower 2 is converted to voltage signal, after precise rectification circuit 3 rectification, this signal is compared by the threshold criteria voltage of voltage comparator U1 Yu threshold criteria voltage device 4, the voltage comparator U1 output low level when current value exceedes threshold criteria, control IGBT drive circuit 5 and temporarily turn off IGBT, output electric current is made to be maintained on a threshold current, thus protect IGBT to be damaged from, this signal gives MCU6 simultaneously, MCU6 carries out timing, if IGBT electric current is still very big after a period of time, explanation is loaded with problem, MCU6 is by closedown power supply and reports to the police.So when the motor is energized, dash current may be limited in the IGBT scope that can bear, and before MCU6 closes power supply and reports to the police, motor can terminate start-up course and enter normal operating condition, thus not only starting motor but also protect IGBT.
As shown in Figure 2, voltage follower circuit 2 includes the first amplifier U2, the inverting input of the first amplifier U2 is connected to current sensor 1 by the 4th resistance R4, the in-phase input end of the first amplifier U2 is connected to circuit ground by the 6th resistance R6, the outfan of the first amplifier U2 is connected to precise rectification circuit 3, and is also associated with the 5th resistance R5 between the inverting input of the first amplifier U2 and outfan.
As shown in Figure 3, precise rectification circuit 3 includes: the second amplifier U3 and the three amplifier U4, the inverting input of the second amplifier U3 is connected to voltage follower circuit 2 through the 7th resistance R7, and the inverting input of the second amplifier U3 is connected to the reverse input end of the 3rd amplifier U4 through the 7th resistance R7 and the ten resistance R10；The in-phase input end of the second amplifier U3 is connected to power supply ground through the 8th resistance R8；The outfan of the second amplifier U3 and the anode of the first diode D1 connect, and the negative electrode of the first diode D1 is connected to the inverting input of the second amplifier U3；The outfan of the second amplifier U3 and the negative electrode of the second diode D2 connect, and the anode of the second diode D2 is connected to the reverse input end of the second amplifier U3 through the 9th resistance R9, is connected to the inverting input of the 3rd amplifier U4 through the 11st resistance R11 respectively；The normal phase input end of the 3rd amplifier U4 is connected to power supply ground through the 13rd resistance R13；The inverting input of the 3rd amplifier U4 is connected to the outfan of the 3rd amplifier U4 through the 12nd resistance R12, and the outfan of the 3rd amplifier U4 is connected to the inverting input of described voltage comparator.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent replacement and improvement etc. made within spirit of the present utility model and principle, should be included within protection domain of the present utility model.
Claims (3)
1. one kind prevents the circuit that electric motor starting dash current causes power protection, it is characterised in that including: the current sensor (1) that is sequentially connected with, voltage follower circuit (2), precise rectification circuit (3)；
Precise rectification circuit (3) is connected with the reverse input end of voltage comparator (U1)；The in-phase input end of voltage comparator (U1) is connected to threshold criteria voltage device (4) through the first resistance (R1), is connected to the outfan of voltage comparator (U1) through the second resistance (R2)；The outfan of voltage comparator (U1) is connected to circuit power (VCC) through the 3rd resistance (R3), and the outfan of voltage comparator (U1) is also connected with IGBT drive circuit (5) and MCU (6) respectively.
2. prevent electric motor starting dash current from causing the circuit of power protection as claimed in claim 1, it is characterized in that, voltage follower circuit (2) includes the first amplifier (U2), the inverting input of the first amplifier (U2) is connected to current sensor (1) by the 4th resistance (R4), the in-phase input end of the first amplifier (U2) is connected to circuit ground by the 6th resistance (R6), the outfan of the first amplifier (U2) is connected to precise rectification circuit (3), and first amplifier (U2) inverting input and outfan between be also associated with the 5th resistance (R5).
3. prevent electric motor starting dash current from causing the circuit of power protection as claimed in claim 1; it is characterized in that; precise rectification circuit (3) including: the second amplifier (U3) and the 3rd amplifier (U4); the inverting input of the second amplifier (U3) is connected to voltage follower circuit (2) through the 7th resistance (R7), and the inverting input of the second amplifier (U3) is connected to the reverse input end of the 3rd amplifier (U4) through the 7th resistance (R7) and the tenth resistance (R10)；The in-phase input end of the second amplifier (U3) is connected to power supply ground through the 8th resistance (R8)；The outfan of the second amplifier (U3) and the anode of the first diode (D1) connect, and the negative electrode of the first diode (D1) is connected to the inverting input of the second amplifier (U3)；The outfan of the second amplifier (U3) and the negative electrode of the second diode (D2) connect, and the anode of the second diode (D2) is connected to the reverse input end of the second amplifier (U3) through the 9th resistance (R9), is connected to the inverting input of the 3rd amplifier (U4) through the 11st resistance (R11) respectively；The normal phase input end of the 3rd amplifier (U4) is connected to power supply ground through the 13rd resistance (R13)；The inverting input of the 3rd amplifier (U4) is connected to the outfan of the 3rd amplifier (U4) through the 12nd resistance (R12), and the outfan of the 3rd amplifier (U4) is connected to the inverting input of described voltage comparator (U1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620139136.5U CN205356197U (en) | 2016-02-24 | 2016-02-24 | Circuit for preventing power source protection caused by overlarge motor starting surge currents |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620139136.5U CN205356197U (en) | 2016-02-24 | 2016-02-24 | Circuit for preventing power source protection caused by overlarge motor starting surge currents |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205356197U true CN205356197U (en) | 2016-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620139136.5U Expired - Fee Related CN205356197U (en) | 2016-02-24 | 2016-02-24 | Circuit for preventing power source protection caused by overlarge motor starting surge currents |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205356197U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532626A (en) * | 2016-12-09 | 2017-03-22 | 大禹电气科技股份有限公司 | Instantaneous overcurrent protection circuit of medium-high voltage variable-frequency speed regulating device and frequency converter |
-
2016
- 2016-02-24 CN CN201620139136.5U patent/CN205356197U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532626A (en) * | 2016-12-09 | 2017-03-22 | 大禹电气科技股份有限公司 | Instantaneous overcurrent protection circuit of medium-high voltage variable-frequency speed regulating device and frequency converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160629 Termination date: 20200224 |