CN207320816U - Brushless electric machine current foldback circuit - Google Patents
Brushless electric machine current foldback circuit Download PDFInfo
- Publication number
- CN207320816U CN207320816U CN201721021416.7U CN201721021416U CN207320816U CN 207320816 U CN207320816 U CN 207320816U CN 201721021416 U CN201721021416 U CN 201721021416U CN 207320816 U CN207320816 U CN 207320816U
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- triode
- resistance
- parallel circuits
- current foldback
- pump housing
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Abstract
The utility model discloses a kind of brushless electric machine current foldback circuit; include the triode of a PNP; the emitter of triode is connected with being connected the DC power anode of the pump housing; the collector of triode is electrically connected with collector resistance and RC parallel circuits; RC parallel circuits are parallel between transistor base and emitter; transistor base is sequentially connected in series resistance and thermistor; the thermistor other end is connected with the DC power anode of the pump housing, and the inverter circuit positive polarity of the tandem node and the pump housing of resistance and thermistor is electrically connected；It is in series with RC parallel circuits on the collector of triode, the DC power supply earth polar of RC parallel circuits one end and the pump housing is electrically connected, and RC parallel circuits other end output overcurrent signal, overcurrent signal is exported to motor driving controling circuit.Using relatively simple current foldback circuit, current foldback circuit manufacture cost is low, and can preferably take into account overcurrent protection effect and cost control effect.
Description
Technical field
A kind of over current of motor protector is the utility model is related to, more particularly, to a kind of nothing of use in the pump housings such as water pump
Brush motor current foldback circuit.
Background technology
Or the brushless electric machine in the pump housings such as existing water pump is to be not provided with current foldback circuit, or simple use
Simplest over-current protection device, overcurrent protection effect is relatively limited, or the design of used current foldback circuit is more
Complexity, causes final products cost manufacture cost higher, it is impossible to preferably to take into account overcurrent protection effect and cost control effect.
Utility model content
The utility model does not have overcurrent protection either overcurrent protection too to solve the brushless electric machine of existing pump product
Simply, protecting effect is weaker or current foldback circuit design is complex, causes final products cost manufacture cost higher,
The present situation such as overcurrent protection effect and cost control effect cannot preferably be taken into account and provided it is a kind of both can be used it is relatively simple
Current foldback circuit, current foldback circuit manufacture cost is low, and can preferably take into account overcurrent protection effect and cost control effect
Brushless electric machine current foldback circuit.
The utility model is that concrete technical scheme is used by solving above-mentioned technical problem：A kind of brushless electric machine overcurrent is protected
Protection circuit, it is characterised in that：Include the triode of a PNP, the emitter of triode and the DC power anode for being connected the pump housing
It is connected, the collector of triode is electrically connected with collector resistance and RC parallel circuits, between transistor base and emitter simultaneously
The first RC parallel circuits are associated with, transistor base is sequentially connected in series second resistance and sampling resistor, the sampling resistor other end and the pump housing
DC power anode be connected, the inverter circuit positive polarity of the tandem node of second resistance and sampling resistor and the pump housing mutually electricity
Connection；The DC power supply earth polar of the 2nd RC parallel circuits, RC parallel circuits one end and the pump housing is in series with the collector of triode
It is electrically connected, the 2nd RC parallel circuits other end output overcurrent signal, overcurrent signal is exported to motor driving controling circuit.
When the power consumption electric current of whole inverter circuit is more than current foldback circuit setting maximum, triode ON, the 2nd RC electricity in parallel
Road exports overcurrent signal, performs overcurrent protection；When the power consumption electric current of whole inverter circuit is less than 70A, triode is closed, the
Two RC parallel circuits do not have overcurrent signal output, brushless electric machine normal operation；Use relatively simple current foldback circuit, mistake
Stream protection circuit manufacture cost is low, and can preferably take into account overcurrent protection effect and cost control effect.
Preferably, when the power consumption electric current of whole inverter circuit is more than 70A, triode ON, the 2nd RC parallel circuits
Export overcurrent signal；When the power consumption electric current of whole inverter circuit is less than 70A, triode is closed, and the 2nd RC parallel circuits do not have
There is overcurrent signal output.Improve the easy and effective property of overcurrent protection.
Preferably, the sampling resistor uses 0.01 Ω/3W power resistors.Improve the sampling in current foldback circuit
Reaction sensitivity and operating power reliability and stability, improve overcurrent protection response sensitivity and accuracy.
Preferably, the triode uses the PNP triode of model MMBT5401.Effectively realized convection current telecommunications
Number output with shut-off control, circuit structure is simple, manufacture cost it is low.
Preferably, the collector resistance includes 3rd resistor and the 4th resistance being serially connected, the 2nd RC is in parallel
Circuit is in parallel using the 5th resistance and the second capacitance, and the 4th resistance is in series with the 5th resistance, the 5th resistance other end and pump
The DC power supply earth polar of body is electrically connected.Improve the effective convenience of adjusting of overcurrent electric signal output.
The beneficial effects of the utility model are：Set most when the power consumption electric current of whole inverter circuit is more than current foldback circuit
During big value, triode ON, the 2nd RC parallel circuits output overcurrent signal, performs overcurrent protection；When whole inverter circuit
When power consumption electric current is less than 70A, triode is closed, and the 2nd RC parallel circuits do not have overcurrent signal output, and brushless electric machine is normally transported
OK；Using relatively simple current foldback circuit, current foldback circuit manufacture cost is low, and can preferably take into account overcurrent protection effect
Fruit and cost control effect.
Brief description of the drawings：
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the structure diagram of the utility model brushless electric machine current foldback circuit.
Embodiment
In embodiment shown in Fig. 1, a kind of brushless electric machine current foldback circuit, includes the triode Q1 of a PNP, three poles
The emitter of pipe is connected with being connected the DC power anode VDC of the pump housing, and the collector of triode is electrically connected with collector resistance
With RC parallel circuits, the first RC parallel circuits are parallel between transistor base and emitter, the first RC parallel circuits are by first
Resistance R1 and the first capacitance C1 is in parallel to be formed, and transistor base is sequentially connected in series second resistance R2 and sampling resistor RM1, sampling resistor
The RM1 other ends are connected with the DC power anode VDC of the pump housing, the tandem node and pump of second resistance R2 and sampling resistor RM1
The inverter circuit positive polarity V+ of body is electrically connected；The 2nd RC parallel circuits, RC electricity in parallel are in series with the collector of triode
The DC power supply earth polar SGND of road one end and the pump housing is electrically connected, the 2nd RC parallel circuits other end output overcurrent signal Uo,
Overcurrent signal Uo is exported to motor driving controling circuit, and overcurrent signal Uo can be inputted to single chip circuit and be performed protection act
Or the execution circuit of other executable protection work.When the power consumption electric current of whole inverter circuit is more than 70A, triode ON,
2nd RC parallel circuits export overcurrent signal；When the power consumption electric current of whole inverter circuit is less than 70A, triode is closed, the
Two RC parallel circuits do not have overcurrent signal output.Sampling resistor uses 0.01 Ω/3W power resistors.Triode uses model
The PNP triode of MMBT5401.Collector resistance includes the 3rd resistor R3 and the 4th resistance R4 being serially connected, and the 2nd RC is in parallel
Circuit is in parallel composition using the 5th resistance R5 and the second capacitance C2, and the 4th resistance R4 and the 5th resistance R5 is in series, the 5th electricity
The DC power supply earth polar SGND of the resistance R5 other ends and the pump housing is electrically connected.
This circuit utilizes PNP pipe Veb>Triode ON during 0.7V, the characteristic of Veb≤0.7V shut-offs, to do driver
Current protection.
When the power consumption electric current of whole inverter circuit is more than 70A, V+=Vdc-I*RM1=Vdc-70A*0.01 Ω=24V-
0.7V=23.3V, PNP triode conducting at this time, the voltage of overcurrent electrical signal Uo is Uo=R5/ (R3+R4+r5) * Vdc
=1/ (18+18+1) * 24V=0.648V, perform overcurrent protection.When the power consumption electric current of whole inverter circuit is less than in 70A, V+>
23.3V, triode are closed, Uo=0V, brushless electric machine normal operation.
Above content and structure describes the excellent of the basic principle of the utility model product, main feature and the utility model
Point, it should be understood by those skilled in the art that.The principle for simply illustrating the utility model described in examples detailed above and specification,
On the premise of not departing from the spirit and scope of the utility model, the utility model also has various changes and modifications, these changes
Belonged to improving within claimed the scope of the utility model.The utility model requires protection scope will by appended right
Ask book and its equivalent thereof.
Claims (5)
- A kind of 1. brushless electric machine current foldback circuit, it is characterised in that：Include the triode of a PNP, the emitter of triode It is connected with the DC power anode for being connected the pump housing, the collector of triode is electrically connected with collector resistance and RC parallel circuits, The first RC parallel circuits are parallel between transistor base and emitter, transistor base is sequentially connected in series second resistance and sampling electricity Resistance, the sampling resistor other end are connected with the DC power anode of the pump housing, the tandem node and pump of second resistance and sampling resistor The inverter circuit positive polarity of body is electrically connected；The 2nd RC parallel circuits, RC parallel circuits are in series with the collector of triode One end and the DC power supply earth polar of the pump housing are electrically connected, the 2nd RC parallel circuits other end output overcurrent signal, overcurrent letter Number output is to motor driving controling circuit.
- 2. brushless electric machine current foldback circuit described in accordance with the claim 1, it is characterised in that：When the power consumption of whole inverter circuit When electric current is more than 70A, triode ON, the 2nd RC parallel circuits output overcurrent signal；When the power consumption electricity of whole inverter circuit When stream is less than 70A, triode is closed, and the 2nd RC parallel circuits do not have overcurrent signal output.
- 3. brushless electric machine current foldback circuit described in accordance with the claim 1, it is characterised in that：The sampling resistor uses 0.01 Ω/3W power resistors.
- 4. according to the brushless electric machine current foldback circuit described in claim 1 or 2, it is characterised in that：The triode uses The PNP triode of model MMBT5401.
- 5. brushless electric machine current foldback circuit described in accordance with the claim 1, it is characterised in that：The collector resistance includes The 3rd resistor being serially connected and the 4th resistance, the 2nd RC parallel circuits are in parallel using the 5th resistance and the second capacitance, and the 4th Resistance is in series with the 5th resistance, and the DC power supply earth polar of the 5th resistance other end and the pump housing is electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721021416.7U CN207320816U (en) | 2017-08-16 | 2017-08-16 | Brushless electric machine current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721021416.7U CN207320816U (en) | 2017-08-16 | 2017-08-16 | Brushless electric machine current foldback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207320816U true CN207320816U (en) | 2018-05-04 |
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ID=62431489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721021416.7U Active CN207320816U (en) | 2017-08-16 | 2017-08-16 | Brushless electric machine current foldback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207320816U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109398475A (en) * | 2018-12-04 | 2019-03-01 | 厦门嘉裕德汽车电子科技有限公司 | A kind of anti-crash protection circuit |
-
2017
- 2017-08-16 CN CN201721021416.7U patent/CN207320816U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109398475A (en) * | 2018-12-04 | 2019-03-01 | 厦门嘉裕德汽车电子科技有限公司 | A kind of anti-crash protection circuit |
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