CN203911449U - Over-current protection circuit of medical centrifuge motor - Google Patents
Over-current protection circuit of medical centrifuge motor Download PDFInfo
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- CN203911449U CN203911449U CN201420361612.9U CN201420361612U CN203911449U CN 203911449 U CN203911449 U CN 203911449U CN 201420361612 U CN201420361612 U CN 201420361612U CN 203911449 U CN203911449 U CN 203911449U
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- potentiometer
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- nand gate
- electric capacity
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Abstract
The utility model discloses an over-current protection circuit of a medical centrifuge motor. The over-current protection circuit comprises a direct current power supply, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, resistors from a first resistor to a sixth resistor, a first potentiometer, a second potentiometer, a third potentiometer, a first NAND gate, a second NAND gate, a third NAND gate, a first triode, a second triode, a first diode and a second diode, a relay and the centrifuge motor. Compared with the prior art, when current in the over-current protection circuit is too large, the relay can disconnect the working power source of the medical centrifuge motor, and over-current protection can be realized. The over-current protection circuit of the medical centrifuge motor has the advantages of high reliability, simple structure, low manufacturing cost and high popularization value.
Description
Technical field
The utility model relates to a kind of current foldback circuit, relates in particular to a kind of current foldback circuit of medical centrifuge motor.
Background technology
Centrifuge isolation technics is the new technology that the state in a centrifugal occasion of practicality grows up according to particle; along with social development and scientific and technological progress; centrifugal separation technique is also more and more ripe; medical centrifuge is at the current hospital laboratory equipment that is absolutely necessary; its service behaviour is had relatively high expectations; need to protect preferably it; the current foldback circuit functional reliability of medical centrifuge motor is now lower; cost of manufacture is higher, has caused the lower situation of its overall price/performance ratio.
Utility model content
The purpose of this utility model is just to provide in order to address the above problem a kind of current foldback circuit of medical centrifuge motor.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises DC power supply, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first resistance to the six resistance, the first potentiometer, the second potentiometer, the 3rd potentiometer, the first NAND gate, the second NAND gate, the 3rd NAND gate, the first triode, the second triode, the first diode, the second diode, relay and centrifugal motor, the anodal while of described DC power supply and the positive pole of described the first electric capacity, the first end of described the second resistance, the first end of described the 4th electric capacity, the first end of described relay coil selects the first end of contact to be connected with described relay, the negative pole while of described DC power supply and the first end of described the first potentiometer, the sliding end of described the first potentiometer, the negative pole of described the 3rd electric capacity, the collector electrode of described the second triode, the emitter of described the first triode, the negative pole of described the second electric capacity is connected with the first end of described the 3rd resistance, and the second end of described the first potentiometer is connected with the first end of described the first resistance, the second end while of described the first resistance and the negative pole of described the first electric capacity, the second input of the first input end of described the first NAND gate and described the first NAND gate is connected, the output of described the first NAND gate is connected with the first input end of described the 3rd NAND gate, the second end of described the second resistance is connected with the sliding end of described the second potentiometer with the first end of described the second potentiometer simultaneously, the second end while of described the second potentiometer and the collector electrode of described the first triode, the second input of the first input end of described the second NAND gate and described the second NAND gate is connected, the base stage while of described the first triode and the positive pole of described the second electric capacity, the second end of described the 3rd resistance and the first end of described centrifugal motor are connected, the output of described the second NAND gate is connected with the first end of described the 3rd potentiometer with the negative pole of described the first diode simultaneously, the second end while of described the 3rd potentiometer and the sliding end of described the 3rd potentiometer, the positive pole of described the 3rd electric capacity, the positive pole of described the first diode is connected with the second input of described the 3rd NAND gate, the output of described the 3rd NAND gate is connected with the first end of described the 4th resistance, the second end of described the 4th resistance is connected with the first end of described the 5th resistance with the base stage of described the second triode simultaneously, the second end of described the 5th resistance selects the second end of contact to be connected with described relay, the emitter of described the second triode is connected with the positive pole of described the second diode with the second end of described relay coil simultaneously, the second end of described the 4th electric capacity is connected with the first end of described the 6th resistance, the second end of described the 6th resistance selects the 3rd end of contact and the second end of described centrifugal motor to be connected with described relay simultaneously.
Particularly, described the first electric capacity, described the second electric capacity and described the 3rd electric capacity are polar capacitor.
The beneficial effects of the utility model are:
The current foldback circuit of a kind of medical centrifuge motor described in the utility model, when electric current is excessive, relay can disconnect centrifugal motor working power; the object that reaches overcurrent protection, functional reliability is high, simple in structure; cost of manufacture is lower, has the value of higher penetration and promotion.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the current foldback circuit of a kind of medical centrifuge motor described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, the utility model comprises DC power supply DC, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the first resistance R 1 is to the 6th resistance R 6, the first potentiometer W1, the second potentiometer W2, the 3rd potentiometer W3, the first NAND gate IC1, the second NAND gate IC2, the 3rd NAND gate IC3, the first triode Q1, the second triode Q2, the first diode D1, the second diode D2, relay K and centrifugal motor M, the anodal while of DC power supply DC and the positive pole of the first capacitor C 1, the first end of the second resistance R 2, the first end of the 4th capacitor C 4, the first end of relay K coil selects the first end of contact K-1 to be connected with relay K, the negative pole while of DC power supply DC and the first end of the first potentiometer W1, the sliding end of the first potentiometer W1, the negative pole of the 3rd capacitor C 3, the collector electrode of the second triode Q2, the emitter of the first triode Q1, the negative pole of the second capacitor C 2 is connected with the first end of the 3rd resistance R 3, and the second end of the first potentiometer W1 is connected with the first end of the first resistance R 1, the second end while of the first resistance R 1 and the negative pole of the first capacitor C 1, the first input end of the first NAND gate IC1 is connected with the second input of the first NAND gate IC1, the output of the first NAND gate IC1 is connected with the first input end of the 3rd NAND gate IC3, the second end of the second resistance R 2 is connected with the sliding end of the second potentiometer W2 with the first end of the second potentiometer W2 simultaneously, the second end while of the second potentiometer W2 and the collector electrode of the first triode Q1, the first input end of the second NAND gate IC2 is connected with the second input of the second NAND gate IC2, the base stage while of the first triode Q1 and the positive pole of the second capacitor C 2, the second end of the 3rd resistance R 3 is connected with the first end of centrifugal motor M, the output of the second NAND gate IC2 is connected with the first end of the 3rd potentiometer W3 with the negative pole of the first diode D1 simultaneously, the second end while of the 3rd potentiometer W3 and the sliding end of the 3rd potentiometer W3, the positive pole of the 3rd capacitor C 3, the positive pole of the first diode D1 is connected with the second input of the 3rd NAND gate IC3, the output of the 3rd NAND gate IC3 is connected with the first end of the 4th resistance R 4, the second end of the 4th resistance R 4 is connected with the first end of the 5th resistance R 5 with the base stage of the second triode Q2 simultaneously, the second end of the 5th resistance R 5 selects the second end of contact K-1 to be connected with relay K, the emitter of the second triode Q2 is connected with the positive pole of the second diode D2 with the second end of relay K coil simultaneously, the second end of the 4th capacitor C 4 is connected with the first end of the 6th resistance R 6, the second end of the 6th resistance R 6 selects the 3rd end of contact K-1 and the second end of centrifugal motor M to be connected with relay K simultaneously, the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 3 are polar capacitor.
The current foldback circuit of a kind of medical centrifuge motor described in the utility model, the 3rd resistance R 3 is current sampling resistor, in order to prevent that the large electric current of centrifugal motor M generation when starting from causing the misoperation of circuit, by the first capacitor C 1, the first resistance R 1, the first potentiometer W1 and a plurality of NAND gate have formed power-on protection delay circuit, when centrifugal motor M starts to start, no-voltage in the first capacitor C 1, the first NAND gate IC1 output low level now, the 3rd NAND gate IC3 exports high level, make the second triode Q2 in cut-off state, relay K is not worked, centrifugal motor M can obtain normal power supply, when the voltage in the first capacitor C 1 is elevated to certain value gradually, the first NAND gate IC1 overturns, output high level, the power cut-off of power-on protection delayed startup circuit, serve the output state of the 3rd NAND gate IC3 by the second potentiometer W2, the second resistance R 2, the current detection circuit that the first triode Q1 and the 3rd resistance R 3 etc. form is controlled, when electric current being detected when excessive, the transposition of relay K contact, disconnect centrifugal motor M, reach the object of overcurrent protection, functional reliability is high, the utility model is simple in structure, cost of manufacture is lower, the value with higher penetration and promotion.
Claims (2)
1. a current foldback circuit for medical centrifuge motor, is characterized in that: comprise DC power supply, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first resistance to the six resistance, the first potentiometer, the second potentiometer, the 3rd potentiometer, the first NAND gate, the second NAND gate, the 3rd NAND gate, the first triode, the second triode, the first diode, the second diode, relay and centrifugal motor, the anodal while of described DC power supply and the positive pole of described the first electric capacity, the first end of described the second resistance, the first end of described the 4th electric capacity, the first end of described relay coil selects the first end of contact to be connected with described relay, the negative pole while of described DC power supply and the first end of described the first potentiometer, the sliding end of described the first potentiometer, the negative pole of described the 3rd electric capacity, the collector electrode of described the second triode, the emitter of described the first triode, the negative pole of described the second electric capacity is connected with the first end of described the 3rd resistance, and the second end of described the first potentiometer is connected with the first end of described the first resistance, the second end while of described the first resistance and the negative pole of described the first electric capacity, the second input of the first input end of described the first NAND gate and described the first NAND gate is connected, the output of described the first NAND gate is connected with the first input end of described the 3rd NAND gate, the second end of described the second resistance is connected with the sliding end of described the second potentiometer with the first end of described the second potentiometer simultaneously, the second end while of described the second potentiometer and the collector electrode of described the first triode, the second input of the first input end of described the second NAND gate and described the second NAND gate is connected, the base stage while of described the first triode and the positive pole of described the second electric capacity, the second end of described the 3rd resistance and the first end of described centrifugal motor are connected, the output of described the second NAND gate is connected with the first end of described the 3rd potentiometer with the negative pole of described the first diode simultaneously, the second end while of described the 3rd potentiometer and the sliding end of described the 3rd potentiometer, the positive pole of described the 3rd electric capacity, the positive pole of described the first diode is connected with the second input of described the 3rd NAND gate, the output of described the 3rd NAND gate is connected with the first end of described the 4th resistance, the second end of described the 4th resistance is connected with the first end of described the 5th resistance with the base stage of described the second triode simultaneously, the second end of described the 5th resistance selects the second end of contact to be connected with described relay, the emitter of described the second triode is connected with the positive pole of described the second diode with the second end of described relay coil simultaneously, the second end of described the 4th electric capacity is connected with the first end of described the 6th resistance, the second end of described the 6th resistance selects the 3rd end of contact and the second end of described centrifugal motor to be connected with described relay simultaneously.
2. the current foldback circuit of a kind of medical centrifuge motor according to claim 1, is characterized in that: described the first electric capacity, described the second electric capacity and described the 3rd electric capacity are polar capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420361612.9U CN203911449U (en) | 2014-07-01 | 2014-07-01 | Over-current protection circuit of medical centrifuge motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420361612.9U CN203911449U (en) | 2014-07-01 | 2014-07-01 | Over-current protection circuit of medical centrifuge motor |
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| Publication Number | Publication Date |
|---|---|
| CN203911449U true CN203911449U (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420361612.9U Active CN203911449U (en) | 2014-07-01 | 2014-07-01 | Over-current protection circuit of medical centrifuge motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298161A (en) * | 2014-10-30 | 2015-01-21 | 成都美益达医疗科技有限公司 | Intermittent operation control circuit of centrifugal machine |
| CN104363009A (en) * | 2014-11-03 | 2015-02-18 | 成都美益达医疗科技有限公司 | Overcurrent protector of brushless direct-current serum centrifuge |
| CN108923385A (en) * | 2018-08-23 | 2018-11-30 | 明光市鸿晟机电设备制造有限公司 | A kind of motor driving protection circuit of steering controller |
-
2014
- 2014-07-01 CN CN201420361612.9U patent/CN203911449U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298161A (en) * | 2014-10-30 | 2015-01-21 | 成都美益达医疗科技有限公司 | Intermittent operation control circuit of centrifugal machine |
| CN104363009A (en) * | 2014-11-03 | 2015-02-18 | 成都美益达医疗科技有限公司 | Overcurrent protector of brushless direct-current serum centrifuge |
| CN108923385A (en) * | 2018-08-23 | 2018-11-30 | 明光市鸿晟机电设备制造有限公司 | A kind of motor driving protection circuit of steering controller |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |