CN204597461U - A kind of brshless DC motor current foldback circuit - Google Patents
A kind of brshless DC motor current foldback circuit Download PDFInfo
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- CN204597461U CN204597461U CN201520329221.3U CN201520329221U CN204597461U CN 204597461 U CN204597461 U CN 204597461U CN 201520329221 U CN201520329221 U CN 201520329221U CN 204597461 U CN204597461 U CN 204597461U
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Abstract
The utility model relates to a kind of brshless DC motor current foldback circuit, comprises rectified three-phase circuit, two bleeder circuits, two comparator circuits.Rectified three-phase circuit in brshless DC motor current foldback circuit receives three-phase current information, and electric current, after over commutation, is changed electric current via follow-up bleeder circuit, converts voltage and then the input as follow-up comparison circuit to.Two comparators compare a positive voltage, a negative voltage and given voltage respectively.When system is without over-current state, two comparators all export high level, and subsequent conditioning circuit is failure to actuate; When there is overcurrent condition, two comparators all can output low level, and subsequent conditioning circuit action, takes measures, and controls motor and circuit with protective circuit.The utility model is detected by hardware circuit, makes overcurrent in time and judges, takes measures, to reach the better protective effect of circuit; Structure is simple, stable performance, cost is lower and accuracy is high.
Description
Technical field
The utility model relates to a kind of current foldback circuit, particularly relates to a kind of current foldback circuit of brshless DC motor.
Background technology
Brshless DC motor is through development for a long time, and present application is very extensive, as automobile, instrument, industrial industry control, automation and Aero-Space etc.In following considerable time, brshless DC motor will continue to play its very important effect.For the current foldback circuit of brshless DC motor, its existing control strategy be mostly adopt software carry out control circui, testing circuit over-current signal detected after by software identification, judge and then take measures.But the mode of this employing software control there will be response not in time, postpones the control time to circuit, and then some unnecessary losses may be caused to occur.
Summary of the invention
In order to solve the problem, the utility model provides a kind of brshless DC motor current foldback circuit, is detected by hardware circuit, makes overcurrent in time and judges, takes measures, to reach the better protective effect of circuit; Structure is simple, stable performance, cost is lower and accuracy is high.
For achieving the above object, concrete scheme of the present utility model is:
A kind of brshless DC motor current foldback circuit, comprise rectified three-phase circuit, bleeder circuit one, bleeder circuit two, comparator circuit one, comparator circuit two, rectified three-phase circuit is diode rectifier bridge, diode rectifier bridge comprises three brachium pontis, three phase lines of direct current machine phase current are connected to the mid point of three brachium pontis, bleeder circuit one comprises the first resistance, second resistance, first electric capacity, comparator circuit one comprises the first current-limiting resistance, second current-limiting resistance, first voltage comparator, pull-up resistor, one end of first current-limiting resistance connects given positive voltage, the other end of the first current-limiting resistance connects the normal phase input end of the first voltage comparator, one end of the first resistance of bleeder circuit one is connected with the cathode output end of diode rectifier bridge, the other end of the first resistance and one end of the second resistance, one end of first electric capacity, one end of second current-limiting resistance connects simultaneously, the other end of the second resistance, the other end of the first electric capacity simultaneously with the power supply negative terminal of the first voltage comparator, earth terminal connects, the other end of the second current-limiting resistance connects the inverting input of the first voltage comparator, the power positive end of the first voltage comparator connects positive supply, the power supply negative terminal of the first voltage comparator is connected with earth terminal and ground connection, the output of the first voltage comparator connects one end of pull-up resistor, the other end of pull-up resistor connects positive supply, bleeder circuit two comprises the 3rd resistance, 4th resistance, second electric capacity, comparator circuit two comprises the 3rd current-limiting resistance, 4th current-limiting resistance, second voltage comparator, one end of 4th current-limiting resistance connects given negative voltage, the other end of the 4th current-limiting resistance connects the inverting input of the second voltage comparator, one end of 3rd resistance of bleeder circuit two connects the cathode output end of diode rectifier bridge, the other end of the 3rd resistance and one end of the 4th resistance, one end of second electric capacity, one end of 3rd current-limiting resistance connects simultaneously, the other end of the 4th resistance and the other end common ground of the second electric capacity, the other end of the 3rd current-limiting resistance is connected with the normal phase input end of the second voltage comparator, the power positive end of the second voltage comparator connects positive supply, the power supply negative terminal of the second voltage comparator connects negative supply, the earth terminal ground connection of the second voltage comparator, the output of the first voltage comparator connects the output of the second voltage comparator, the output of the second voltage comparator is ERROR signal output part.
First voltage comparator, the second voltage comparator adopt LM311 voltage comparator respectively.
Each diode of rectified three-phase circuit adopts IN4148 diode respectively.
Compared with prior art, advantage of the present utility model and beneficial effect have:
1, in time, effectively over-current signal can be detected and take corresponding measure protective circuit in time by the control of hardware circuit.
2, circuit is simple and practical, good stability, reduces failure rate.
3, with low cost, be easy to safeguard, market is widely used.
Accompanying drawing explanation
Fig. 1 is circuit connection structure schematic diagram of the present utility model.
Fig. 2 is theory diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
Embodiment: see accompanying drawing 1, accompanying drawing 2, a kind of brshless DC motor current foldback circuit, comprise rectified three-phase circuit, bleeder circuit one, bleeder circuit two, comparator circuit one, comparator circuit two, rectified three-phase circuit is diode rectifier bridge, diode rectifier bridge comprises three brachium pontis, be respectively the first brachium pontis, second brachium pontis, 3rd brachium pontis, first brachium pontis comprises the diode D1 of serial connection, D4, second brachium pontis comprises the diode D3 of serial connection, D6, 3rd brachium pontis comprises the diode D5 of serial connection, D2, three phase lines of direct current machine phase current are connected to the mid point of three brachium pontis, its connection is: phase current ia line is connected with the negative electrode of diode D4 with the anode of diode D1, phase current ib line is connected with the negative electrode of diode D6 with the anode of diode D3, phase current ic line is connected with the negative electrode of diode D2 with the anode of diode D5.
Bleeder circuit one comprises the first resistance R298, second resistance R300, first electric capacity C106, comparator circuit one comprises the first current-limiting resistance R31, second current-limiting resistance R32, LM311 first voltage comparator U64, No. 2 pins of another termination comparator U64 of the given positive voltage signal of the one termination+REF of pull-up resistor R294, resistance R31, resistance R31, the cathode output end diode D1 of diode rectifier bridge, D3, the negative electrode of D5 is connected with one end of resistance R298, the other end of resistance R298 and one end of resistance R300, one end of electric capacity C106, one end of resistance R32 connects simultaneously, the other end of the other end of resistance R300 and electric capacity C106 simultaneously with No. 1 of comparator U64, No. 4 pins connect, No. 3 pins of another termination comparator U64 of resistance R32, No. 5 of comparator U64, No. 6 pins are connected, and No. 8 pins of comparator U64 connect+15V power supply, No. 1 of comparator U64, No. 4 pins connect and ground connection, one end of No. 7 pin connecting resistance R294 of comparator U64, and the other end of resistance R294 connects+15V power supply.
Bleeder circuit two comprises the 3rd resistance R299, 4th resistance R301, second electric capacity C107, comparator circuit two comprises the 3rd current-limiting resistance R33, 4th current-limiting resistance R34, LM311 second voltage comparator U65, one end of R34 connects given negative voltage signal-REF, the other end of R34 connects No. 3 pins of comparator U65, the cathode output end diode D2 of diode rectifier bridge, D4, the anode of D6 is connected with one end of resistance R299, the other end of resistance R299 and one end of resistance R301, one end of electric capacity C107, one end of resistance R33 connects simultaneously, the other end of resistance R301 and the other end common ground of electric capacity C107, No. 2 pins of another termination comparator U65 of resistance R33, No. 8 pins of comparator U65 connect+15V power supply, No. 4 pins of comparator U65 connect-15V power supply, No. 5 of comparator U65, No. 6 pins are connected, No. 1 pin ground connection of comparator U65, No. 7 pins of comparator U64 connect No. 7 pins of comparator U65, No. 7 pins of comparator U65 are ERROR signal output part, i.e. one end of resistance R294, No. 7 pins of comparator U64, No. 7 pins of comparator U65 are connected to ERROR jointly.
Each diode of rectified three-phase circuit adopts IN4148 diode respectively.
Rectified three-phase circuit carries out rectification by gathering the electric current come from brshless DC motor by diode D1, D2, D3, D4, D5, D6, running when diode is different, concrete running is looked electrical current and is determined, makes the electric current collected in follow-up bleeder circuit, carry out dividing potential drop computing respectively; Bleeder circuit one can be arrived after diode to flowing to the electric current come in the middle of three-phase; Bleeder circuit two can be arrived after diode to the electric current spilt out in the middle of three-phase.
Bleeder circuit, to bleeder circuit one, electric current is connected to earth point by resistance R298 and resistance R300, by electric current by the voltage at the known R300 two ends of pressure drop during resistance is:
.To bleeder circuit two, electric current is connected to earth point by resistance R299 and resistance R301, by electric current by the voltage at the known R301 two ends of pressure drop during resistance is:
.
Comparison circuit, to comparison circuit one, determines the output voltage of comparator U64 output No. 7 pins by the size of positive input No. 2 pins and reverse input end No. 3 pin input voltages of comparing LM311 comparator U64.When
<
time, comparator U64 exports high level, and ERROR is high level, does not now have overcurrent, and subsequent conditioning circuit is failure to actuate; When
>
time, comparator U64 output low level, now overcurrent, ERROR is low level, and subsequent conditioning circuit action, takes measures.In comparison circuit, the positive input of comparator U64 has given voltage
, the reverse input end of comparator U65 has given voltage
, compare using the voltage that these two voltages export as reference voltage and bleeder circuit, judge, and then control the output of comparator.
The output of the second voltage comparator U65 of comparator circuit two provides ERROR signal according to the output of comparison circuit; make subsequent conditioning circuit carry out judging, action; carry out controlling in time, accurately to circuit in case there is a need, to reach the object of protective circuit.
Operation principle of the present utility model is: when brshless DC motor runs well, gathered, as the input of the rectified three-phase circuit in brshless DC motor current foldback circuit by current acquisition module to its three-phase current.Electric current, after over commutation, is changed electric current via follow-up bleeder circuit, converts voltage and then the input as follow-up comparison circuit to.Two comparators compare a positive voltage, a negative voltage and given voltage respectively.When system is without over-current state, two comparators all export high level, and subsequent conditioning circuit is failure to actuate; When there is overcurrent condition, two comparators all can output low level, and subsequent conditioning circuit action, takes measures, and controls motor and circuit with protective circuit.
Claims (3)
1. a brshless DC motor current foldback circuit, it is characterized in that: comprise rectified three-phase circuit, bleeder circuit one, bleeder circuit two, comparator circuit one, comparator circuit two, rectified three-phase circuit is diode rectifier bridge, diode rectifier bridge comprises three brachium pontis, three phase lines of direct current machine phase current are connected to the mid point of three brachium pontis, bleeder circuit one comprises the first resistance, second resistance, first electric capacity, comparator circuit one comprises the first current-limiting resistance, second current-limiting resistance, first voltage comparator, pull-up resistor, one end of first current-limiting resistance connects given positive voltage, the other end of the first current-limiting resistance connects the normal phase input end of the first voltage comparator, one end of the first resistance of bleeder circuit one is connected with the cathode output end of diode rectifier bridge, the other end of the first resistance and one end of the second resistance, one end of first electric capacity, one end of second current-limiting resistance connects simultaneously, the other end of the second resistance, the other end of the first electric capacity simultaneously with the power supply negative terminal of the first voltage comparator, earth terminal connects, the other end of the second current-limiting resistance connects the inverting input of the first voltage comparator, the power positive end of the first voltage comparator connects positive supply, the power supply negative terminal of the first voltage comparator is connected with earth terminal and ground connection, the output of the first voltage comparator connects one end of pull-up resistor, the other end of pull-up resistor connects positive supply, bleeder circuit two comprises the 3rd resistance, 4th resistance, second electric capacity, comparator circuit two comprises the 3rd current-limiting resistance, 4th current-limiting resistance, second voltage comparator, one end of 4th current-limiting resistance connects given negative voltage, the other end of the 4th current-limiting resistance connects the inverting input of the second voltage comparator, one end of 3rd resistance of bleeder circuit two connects the cathode output end of diode rectifier bridge, the other end of the 3rd resistance and one end of the 4th resistance, one end of second electric capacity, one end of 3rd current-limiting resistance connects simultaneously, the other end of the 4th resistance and the other end common ground of the second electric capacity, the other end of the 3rd current-limiting resistance is connected with the normal phase input end of the second voltage comparator, the power positive end of the second voltage comparator connects positive supply, the power supply negative terminal of the second voltage comparator connects negative supply, the earth terminal ground connection of the second voltage comparator, the output of the first voltage comparator connects the output of the second voltage comparator, the output of the second voltage comparator is ERROR signal output part.
2. brshless DC motor current foldback circuit according to claim 1, is characterized in that: the first voltage comparator, the second voltage comparator adopt LM311 voltage comparator respectively.
3. brshless DC motor current foldback circuit according to claim 1 and 2, is characterized in that: each diode of rectified three-phase circuit adopts IN4148 diode respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520329221.3U CN204597461U (en) | 2015-05-21 | 2015-05-21 | A kind of brshless DC motor current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520329221.3U CN204597461U (en) | 2015-05-21 | 2015-05-21 | A kind of brshless DC motor current foldback circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204597461U true CN204597461U (en) | 2015-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520329221.3U Expired - Fee Related CN204597461U (en) | 2015-05-21 | 2015-05-21 | A kind of brshless DC motor current foldback circuit |
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| CN (1) | CN204597461U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281297A (en) * | 2015-11-20 | 2016-01-27 | 许继电源有限公司 | An overcurrent protection circuit for a three-phase rectifier |
| CN110265973A (en) * | 2019-06-19 | 2019-09-20 | 贵州航天林泉电机有限公司苏州分公司 | Bilateral electric current hardware protection circuit device suitable for brushless direct current motor driver |
-
2015
- 2015-05-21 CN CN201520329221.3U patent/CN204597461U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281297A (en) * | 2015-11-20 | 2016-01-27 | 许继电源有限公司 | An overcurrent protection circuit for a three-phase rectifier |
| CN110265973A (en) * | 2019-06-19 | 2019-09-20 | 贵州航天林泉电机有限公司苏州分公司 | Bilateral electric current hardware protection circuit device suitable for brushless direct current motor driver |
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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 |
Granted publication date: 20150826 Termination date: 20160521 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |