CN209709672U - A kind of three-phase motor driver overcurrent protective device - Google Patents
A kind of three-phase motor driver overcurrent protective device Download PDFInfo
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- CN209709672U CN209709672U CN201920563361.5U CN201920563361U CN209709672U CN 209709672 U CN209709672 U CN 209709672U CN 201920563361 U CN201920563361 U CN 201920563361U CN 209709672 U CN209709672 U CN 209709672U
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- phase motor
- motor driver
- sampling resistor
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Abstract
The utility model discloses a kind of three-phase motor driver overcurrent protective devices; the three-phase motor driver includes the three-phase inverter bridge circuit of six device for power switching Q1-Q6 composition; protective device includes the MCU with internal comparator and DAC; connect sampling resistor R1, R2, R3 respectively on three current loops of three-phase motor driver, and sampling resistor R4 is in series on the earth bus of three-phase motor driver；The voltage signal of the sampling resistor R4 is connected to the non-inverting input terminal of MCU internal comparator, and DAC setting output threshold voltage is connected to the inverting input terminal of MCU internal comparator, the protection signal that the output signal of MCU internal comparator is turned off as driver PWM.The three-phase motor driver overcurrent protective device of the utility model; save three road comparators than current conventional overcurrent protection scheme, support the input of three tunnels or door and its peripheral capacitance resistance ware; driver cost is reduced, while reducing the cabling on PCB, conducive to the optimization of driver volume.
Description
Technical field
The utility model relates to three-phase motor driver, in particular to a kind of three-phase motor driver overcurrent protective device.
Background technique
Three-phase motor is applied very extensive at present, and especially three-phase motor with permanent magnets is because its energy-efficient advantage is more by user
Favor, will be such that three-phase motor operates normally, then be unable to do without three-phase motor driver.
For a reliable, stable three-phase motor driver, overcurrent protection function is indispensable.Three-phase motor drives
Dynamic device, which only has perfect overcurrent protection function, to protect driver itself and three-phase electricity under various abnormal emergency cases
Machine is without damage.
Three characteristics of the middle term motor driver has three current loops, therefore only each current loop all has overcurrent protection function
Just it is able to achieve complete overcurrent protection function.Solution conventional at present, as shown in Figure 1: 1, by each current loop
Electric current is converted into voltage signal by Hall sensor or sampling resistor；2, the voltage signal of three current loops is distinguished later
Input to three comparators；3, it is compared by the protection threshold voltage with setting, signal is protected on three tunnels of output；4, later will
Three tunnels protection signal passes through or door processing, final output protect signal to MCU all the way；5, MCU detect protection signal after in time
Driver output is turned off, realizes overcurrent protection function.Therefore three road comparators and support three must be used in conventional solution
Road inputs or door.
Currently, electronic product turns to development trend with small-sized, under this development trend, motor driving plate need to be integrated in motor
Inside, therefore have stringenter limitation to the volume of motor driving plate, under current conventional overcurrent protection scheme, because using
Three road comparators, support the input of three tunnels or door and its peripheral capacitance resistance ware, significantly limit motor driven plate bulk
Optimization.
Utility model content
The utility model aim is: providing a kind of three-phase motor driver overcurrent protective device, improves the inspection of overcurrent protection
Survey mode reduces driver cost, while reducing the cabling on PCB, optimizes driver volume.
The technical solution of the utility model is:
A kind of three-phase motor driver overcurrent protective device, the three-phase motor driver include six device for power switching
The three-phase inverter bridge circuit of Q1-Q6 composition, protective device include the MCU with internal comparator and DAC, and three-phase motor drives
Connect sampling resistor R1, R2, R3 respectively on three current loops of dynamic device, is in series on the earth bus of three-phase motor driver
Sampling resistor R4；The voltage signal of the sampling resistor R4 is connected to the non-inverting input terminal of MCU internal comparator, and DAC setting is defeated
Threshold voltage out is connected to the inverting input terminal of MCU internal comparator, and the output signal of MCU internal comparator is as driver
The protection signal of PWM shutdown.
Specifically, the device for power switching Q1-Q3 of the three-phase motor driver is separately connected DC power anode VCC,
Device for power switching Q4-Q6 passes through the same end of sampling resistor R1, R2, R3 connection sampling resistor R4 respectively, and sampling resistor R4 is another
One end ground connection；Node between device for power switching Q1-Q3 and device for power switching Q4-Q6 exports U, V, W three-phase current respectively
To three-phase motor M.
The pwm signal control that the control terminal of the device for power switching Q1-Q6 of the three-phase motor driver is exported by MCU respectively
System.
The utility model has the advantages that:
The three-phase motor driver overcurrent protective device of the utility model is saved than current conventional overcurrent protection scheme
Three road comparators, three tunnels of support input or door and its peripheral capacitance resistance ware, reduce driver cost, while reducing PCB
On cabling, conducive to the optimization of driver volume.
Detailed description of the invention
The utility model is further described with reference to the accompanying drawings and embodiments:
Fig. 1 is existing three-phase motor driver overcurrent protective device schematic diagram；
Fig. 2 is the three-phase motor driver overcurrent protective device schematic diagram of the utility model.
Specific embodiment
Overcurrent protection is the necessary functions of electronic product stabilization, reliability service, in wiring error or motor phase fault,
It must can effectively prevent the damage of driver itself and motor.
Motor driver is all integrated in inside electric machine casing by current many Fan Products, therefore limits motor driver
Spatial volume.Especially in some low power electronic products, due to the limitation of volume, even without fado on motor driver
A patch capacitor is put, under this status, several IC and its peripheral capacitance resistance ware, PCB trace on motor driver can be saved, it is right
There is positive effect very outstanding in the design difficulty for reducing product.Simultaneously because the saving of component, reduces product cost,
Keep its price more competitive.
In the Fan Product of a 80W, this three motor driver overcurrent protection schemes are applied, and are guaranteeing overcurrent
Defencive function effectively, it is reliable under the premise of, simplify the hardware structure of motor driver, reduce product cost, reduce production
The overall volume of product.
As shown in Fig. 2, the three-phase motor driver overcurrent protective device of the utility model, the three-phase motor driver packet
Include the three-phase inverter bridge circuit of six device for power switching Q1-Q6 composition, the power switch device of the three-phase motor driver
Part Q1-Q3 is separately connected DC power anode VCC, and device for power switching Q4-Q6 passes through sampling resistor R1, R2, R3 connection respectively
The same end of sampling resistor R4, sampling resistor R4 other end ground connection；Device for power switching Q1-Q3 and device for power switching Q4-Q6
Between node export U, V, W three-phase current respectively to three-phase motor M.The device for power switching of the three-phase motor driver
The control terminal of Q1-Q6 is controlled by the pwm signal of MCU output respectively.
The utility model protective device includes the MCU with internal comparator and DAC, three electricity of three-phase motor driver
Road series connection sampling resistor R1, R2, R3 respectively is flowed back to, is in series with sampling resistor R4 on the earth bus of three-phase motor driver；
The voltage signal of the sampling resistor R4 is connected to the non-inverting input terminal of MCU internal comparator, and DAC setting exports threshold voltage,
It is connected to the inverting input terminal of MCU internal comparator, the guarantor that the output signal of MCU internal comparator is turned off as driver PWM
Protect signal.
It is assumed that the electric current for flowing through sampling resistor R4 in normal work is up to Ia, sampling resistor R4 is produced when electric current is Ia
Raw voltage signal is Va.Because the sampling resistor R4 voltage signal generated in normal work is up to Va, then set inside MCU
DAC output voltage is Va, and internal comparator exports low level at this time, and it is invalid that PWM turns off module.
Assuming that U, V two-phase of motor have short-circuit generation, there will be biggish electric current Ib to pass through Q1, Q5, sampling resistor from VCC
R2, sampling resistor R4 flow into GND, and Ib is necessarily greater than Ia.Sampling resistor R4 generates voltage under the percussion of high current Ib
Step signal Vb, and Vb must be greater than Va.The non-inverting input terminal voltage Vb of MCU internal comparator is greater than inverting input terminal Va at this time,
Then comparator exports high level, and high level enables PWM and turns off module, forcibly closes Q1-Q6, avoid power MOS and motor
Damage.
The above embodiments are only for explaining the technical ideas and features of the present invention, and its object is to allow be familiar with technique
People can understand the content of the utility model and implement accordingly, do not limit the protection scope of the present invention.It is all
According to the modification that the Spirit Essence of the utility model main technical schemes is done, should all cover in the protection scope of the utility model
Within.
Claims (3)
1. a kind of three-phase motor driver overcurrent protective device, the three-phase motor driver includes six device for power switching
The three-phase inverter bridge circuit of Q1-Q6 composition, it is characterised in that:
Protective device includes the MCU with internal comparator and DAC, is gone here and there respectively on three current loops of three-phase motor driver
Join sampling resistor R1, R2, R3, is in series with sampling resistor R4 on the earth bus of three-phase motor driver；
The voltage signal of the sampling resistor R4 is connected to the non-inverting input terminal of MCU internal comparator, DAC setting output threshold value electricity
Pressure, is connected to the inverting input terminal of MCU internal comparator, what the output signal of MCU internal comparator was turned off as driver PWM
Protect signal.
2. three-phase motor driver overcurrent protective device according to claim 1, which is characterized in that the three-phase motor drives
The device for power switching Q1-Q3 of dynamic device is separately connected DC power anode VCC, and device for power switching Q4-Q6 passes through sampling respectively
Resistance R1, R2, R3 connect the same end of sampling resistor R4, sampling resistor R4 other end ground connection；Device for power switching Q1-Q3 and function
Node between rate switching device Q4-Q6 exports U, V, W three-phase current to three-phase motor M respectively.
3. three-phase motor driver overcurrent protective device according to claim 2, which is characterized in that the three-phase motor drives
The control terminal of the device for power switching Q1-Q6 of dynamic device is controlled by the pwm signal of MCU output respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920563361.5U CN209709672U (en) | 2019-04-24 | 2019-04-24 | A kind of three-phase motor driver overcurrent protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920563361.5U CN209709672U (en) | 2019-04-24 | 2019-04-24 | A kind of three-phase motor driver overcurrent protective device |
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| Publication Number | Publication Date |
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| CN209709672U true CN209709672U (en) | 2019-11-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950877A (en) * | 2019-04-24 | 2019-06-28 | 苏州易德龙科技股份有限公司 | A kind of three-phase motor driver overcurrent protective device |
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2019
- 2019-04-24 CN CN201920563361.5U patent/CN209709672U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950877A (en) * | 2019-04-24 | 2019-06-28 | 苏州易德龙科技股份有限公司 | A kind of three-phase motor driver overcurrent protective device |
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