CN208226558U - A kind of motor protective circuit - Google Patents
A kind of motor protective circuit Download PDFInfo
- Publication number
- CN208226558U CN208226558U CN201820855875.3U CN201820855875U CN208226558U CN 208226558 U CN208226558 U CN 208226558U CN 201820855875 U CN201820855875 U CN 201820855875U CN 208226558 U CN208226558 U CN 208226558U
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- circuit
- motor
- drive circuit
- control module
- main control
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Abstract
The utility model discloses a kind of motor protective circuits, motor protective circuit includes main control module, power circuit and motor-drive circuit, main control module generates control signal and is sent to motor-drive circuit, motor-drive circuit receives the control of main control module, it generates driving signal and is input to motor, the driving signal output end of motor-drive circuit is connected with sample circuit, sampled signal is fed back to motor-drive circuit or main control module by sample circuit, main control module generates power control signal to power circuit, the control that power circuit receives main control module inputs supply voltage or disconnect to motor-drive circuit to motor-drive circuit inputs supply voltage.This motor protective circuit may determine that motor-drive circuit whether there is failure, and the supply voltage for disconnecting motor-drive circuit can be controlled when judgement is out of order, and motor and driving circuit are protected from source.
Description
Technical field
The utility model relates to a kind of protection circuits, specifically, being to be related to a kind of motor protective circuit.
Background technique
Washing machine partial wave wheel and roller two types at present, the rotation of inner cylinder are all using motor driven.Motor is bad
Occupy certain proportion in washing machine is bad after sale, and maintenance cost is higher.The reason of causing electrical fault has very much, wherein just
The case where there are the driving circuit failure in driving plate and then leading to motor damage.The driving of motor need of work electric current, it is different
The current value that motor can bear is not also identical, when the tolerance value that current value is more than motor will be damaged more than motor after a certain period of time
It is bad.There was only hardware overcurrent protection to the protection scheme of motor at present, when current value is more than the overcurrent value of hardware setting, in 2us
Hardware stops electric current output by 6 road IGBT of shutdown, to protect motor and driving circuit.Overcurrent Producing reason has more
Kind, when because when motor-drive circuit damage, such as IGBT itself damage, then it is simple to be cut completely by 6 road waveforms
Power-off stream, motor still has a possibility that damage, so the prior art can not protect motor and driving circuit completely.
Summary of the invention
The utility model mentions to solve existing the technical issues of can not detecting driving circuit failure and leading to motor damage
A kind of motor protective circuit is gone out, can solve the above problem.
In order to solve the above-mentioned technical problem, the utility model is achieved using following technical scheme:
A kind of motor protective circuit, including main control module, power circuit and motor-drive circuit, the motor driven electricity
Road receives the control of the main control module, generates driving signal and is input to motor, the driving signal of the motor-drive circuit
Output end is connected with sample circuit, and sampled signal is fed back to the motor-drive circuit or master control mould by the sample circuit
Block, the main control module generate power control signal to the power supply electricity according to control signal output situation and sampled signal
Road, the power circuit receive the control of the main control module to the motor-drive circuit input supply voltage or disconnect to
The motor-drive circuit inputs supply voltage.
Further, the input terminal of the power circuit is electrically connected by socket with city, and output end exports supply voltage extremely
The motor-drive circuit is in series with fusing resistor, the fusing resistor in the supply voltage output channel of the power circuit
Both ends are parallel with control switch, and the control that the control switch receives the main control module is switched on or off.
Further, the power circuit includes the first filter circuit and rectification circuit, the first filter circuit input
End is connect with socket, and output end is connect with the input terminal of the rectification circuit, the output end output power supply electricity of the rectification circuit
It is depressed into the motor-drive circuit, fusing resistor is connected between first filter circuit and the rectification circuit.
Further, the control switch is relay, and the normally opened contact of the relay is connected in parallel on the fusing resistor
Both ends, the control signal input of the relay connect with a wherein control signal output for the main control module.
Further, the rectification circuit is a rectifier bridge.
Further, the motor-drive circuit generates three tunnel driving signals and is input to motor, the sample circuit packet
Three sampling resistors are included, which connects one to one between three tunnel driving signal output ends and ground, described to adopt
The current sampling signal that three sampling resistors obtain is fed back to the motor-drive circuit by sample circuit.
Further, the sample circuit further includes the second filter circuit, second filter circuit and sampling electricity
Resistance is connected in parallel.
Further, operational amplifier circuit is also connected between the output end of the sample circuit and the motor-drive circuit.
Further, the operational amplifier circuit includes having twin-channel operational amplifier.
Compared with prior art, the advantages and positive effects of the utility model are as follows: the motor protective circuit of the utility model,
It may determine that motor-drive circuit whether there is failure, and control can disconnect motor-drive circuit when judgement is out of order
Supply voltage protects motor and driving circuit from source, and more meets safety requirement, avoids due to motor-drive circuit failure
Caused by damage to motor, and then the hair for the situations such as on fire that can cause to avoid continued power under motor stopping state
It is raw.
After the detailed description of the utility model embodiment is read in conjunction with the figure, other features and advantages of the utility model
It will become clearer.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of embodiment functional-block diagram for the motor protective circuit that the utility model is proposed；
Fig. 2 is a kind of embodiment power circuit diagram for the motor protective circuit that the utility model is proposed；
Fig. 3 is a kind of embodiment motor-drive circuit pin figure for the motor protective circuit that the utility model is proposed；
Fig. 4 is a kind of embodiment sample circuit figure for the motor protective circuit that the utility model is proposed；
Fig. 5 is a kind of embodiment operational amplifier circuit figure for the motor protective circuit that the utility model is proposed.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Embodiment one, the present embodiment propose a kind of motor protective circuit, as shown in Figure 1, including main control module, power supply electricity
Road and motor-drive circuit, main control module generate control signal and are sent to motor-drive circuit, and motor-drive circuit receives
The control of main control module generates driving signal and is input to motor, and the driving signal output end of motor-drive circuit, which is connected with, adopts
Sample circuit, sample circuit sample driving signal, and sampled signal is fed back to motor-drive circuit or main control module,
Main control module generates power control signal to power circuit, the power supply electricity according to control signal output situation and sampled signal
The control that road receives the main control module inputs supply voltage to the motor-drive circuit or disconnects to the motor driven
Circuit inputs supply voltage.The protection philosophy of this motor protective circuit is: on the one hand main control module is sampled by sample circuit
Obtained sampled signal, can obtain the state for being applied to driving signal on motor, and still further aspect can monitor it and be issued
Control signal(l)ing condition, detect sampled signal when it is controlled when signal control motor is shut down and beyond given threshold, then illustrate
Motor-drive circuit breaks down, and is disconnected taking to by way of motor-drive circuit input supply voltage, is protected at this time
Motor-drive circuit and motor are protected from damage, only need to repair or replace power circuit when repairing at this time, can drop
Low maintenance cost.
As shown in Fig. 2, the input terminal of power circuit is electrically connected by socket CN1 with city, output end exports supply voltage
VBus is in series with fusing resistor R3, fusing resistor R3 two in the supply voltage output channel of power circuit to motor-drive circuit
End is parallel with control switch K1, and control switch K1 receives the control switching on off operating mode of main control module.The present embodiment power circuit
Protection philosophy be: control switch K1 is normal open switch, and when electrically connecting by socket CN1 with city, alternating current is by power circuit
Processing circuit after, flow through fusing resistor R3, and convert output supply voltage VBus, supply voltage VBus can be main control module
Power supply, main control module send to control switch K1 after powering on and control signal, and control switch closure is short-circuit by fusing resistor R3, because
This, the conversion that power circuit can continue exports supply voltage VBus, powers for backend load.Due to there is electric current to flow through fusing electricity
The time for hindering R3 is shorter, therefore fusing resistor R3 is not in fusing phenomenon, when detecting that control signal control motor is shut down
And be detected simultaneously by sampled signal beyond given threshold, then illustrate that motor-drive circuit breaks down, main control module is to control at this time
It makes switch K1 and sends control signal, control switch disconnects, and alternating current flows through fusing resistor after the processing circuit of power circuit
R3, and output supply voltage VBus is converted, it can be blown after the rated power more than fusing resistor R3, thus electricity of cutting off the power
The supply voltage on road exports, and then cuts off and enter motor-drive circuit voltage, reach protection motor-drive circuit and motor from
Damage or from secondary damage purpose.
As a preferred embodiment, as shown in Fig. 2, power circuit includes the first filter circuit and rectification circuit, the
One filter circuit input terminal is connect with socket, the input terminal connection of output end and rectification circuit, the output end output of rectification circuit
To motor-drive circuit, fusing resistor is connected between the first filter circuit and rectification circuit supply voltage.First filter circuit
For filtering out the interference signal in alternating current, filter circuit can be used capacitor CX1, inductance L1 electric device in such as Fig. 2 and realize,
Through control switch K1 to rectification circuit, rectification circuit is used to AC signal being rectified into direct current signal defeated filtered current signal
Out.Rectification circuit can be realized using rectifier circuit DB1 as shown in Figure 2 in the present embodiment.
Control switch K1 can realize that the normally opened contact 3,4 of relay is connected in parallel on fusing using relay in the present embodiment
The both ends of resistance R3, the control signal input RS of relay and a wherein control signal output for main control module connect,
The on state of normally opened contact receives the control of main control module.
As shown in figure 3, motor-drive circuit generates three tunnel driving signal (respectively MTR_CURRENT_U, MTR_
CURRENT_V, MTR_CURRENT_W) and it is input to motor, sample circuit includes three sampling resistors, respectively R153,
R154, R155, three sampling resistors R153, R154, the R155 connect one to one in three tunnel driving signal output ends and ground
Between, the current sampling signal that three sampling resistors obtain is fed back to motor-drive circuit by sample circuit.
As shown in figure 3, motor-drive circuit is realized using chip IC 6 in the present embodiment.
As shown in figure 4, sample circuit further include the current-limiting resistance R241 being connect respectively with three tunnel driving signal output ends,
R242, R243, the rear end of three current-limiting resistances are connected separately with diode D241, D242, D243 of one-way conduction.
Preferably, sample circuit further includes the second filter circuit, for filtering out the interference signal in sampled signal, second
Filter circuit is connected in parallel with sampling resistor.As shown in figure 4, the second filter circuit in the present embodiment includes the resistance being in parallel
R244 and capacitor C241.
As shown in figure 3, main control module sends to motor-drive circuit IC6 and controls when main control module controls motor orderly closedown
Signal CPWMUH, CPWMUL, CPWMVH, CPWMVL, CPWMWH, CPWMWL processed, totally 6 road waveforms turn off 6 road IGBT in IC6
(insulated gate bipolar transistor), the output of normal cutoff motor-drive circuit electric current, if motor-drive circuit is normal condition, this
When sample circuit should can't detect driving signal and exported to motor.
Sampled signal ITRIP can be sent to motor-drive circuit, can also be sent directly to main control module, by master control mould
Block is compared judgement, and sampled signal ITRIP is sent to the 15th end of motor-drive circuit IC6 by sample circuit in the present embodiment
The multilevel iudge that IC circuit 6 completes sampled signal, the 14th terminal and master control mould of motor-drive circuit IC6 is driven by motor in son
Block connection, when voltage value is greater than given threshold, the 14th terminal output low level of IC6 is combined to main control module by main control module
Motor stopping whether is currently controlled, and determines whether power circuit and sends power control signal and driven to disconnect to the motor
Dynamic circuit inputs supply voltage.
It is also connected with operational amplifier circuit between the output end and motor-drive circuit of sample circuit, for carrying out sampled signal
Enhanced processing, as shown in figure 5, by the signal MTR_ for wherein all the way for signal, sampling out from sampling resistor R154
CURRENT_V and MTR_ISENSE_V enters the operational amplifier for example with two channel amplifiers in a manner of difference cabling respectively
Part IC7 makes two sampled signals amplify N times, while being superimposed a level by adding and subtracting operational amplifier circuit, finally enters control chip
It is handled.Certainly, the operational amplifier circuit in this patent is not limited to the example above.
Certainly, the above description is not intended to limit the present invention, and the utility model is also not limited to the example above,
The variations, modifications, additions or substitutions that those skilled in the art are made in the essential scope of the utility model,
It should also belong to the protection scope of the utility model.
Claims (9)
1. a kind of motor protective circuit, including main control module, power circuit and motor-drive circuit, which is characterized in that master control
Module generates control signal and is sent to motor-drive circuit, and the motor-drive circuit receives the control of the main control module,
It generates driving signal and is input to motor, the driving signal output end of the motor-drive circuit is connected with sample circuit, described
Sampled signal is fed back to the motor-drive circuit or main control module by sample circuit, and the main control module generates power supply control
To the power circuit, the control that the power circuit receives the main control module is inputted to the motor-drive circuit to supply signal
Piezoelectric voltage is disconnected to motor-drive circuit input supply voltage.
2. motor protective circuit according to claim 1, which is characterized in that the input terminal of the power circuit passes through socket
It is electrically connected with city, output end exports supply voltage to the motor-drive circuit, and the supply voltage output of the power circuit is logical
Fusing resistor is in series in road, the fusing resistor both ends are parallel with control switch, and the control switch receives the master control mould
The control of block is switched on or off.
3. motor protective circuit according to claim 2, which is characterized in that the power circuit includes the first filter circuit
And rectification circuit, the first filter circuit input terminal are connect with socket, output end is connect with the input terminal of the rectification circuit,
For the output end output supply voltage of the rectification circuit to the motor-drive circuit, fusing resistor is connected to first filtering
Between circuit and the rectification circuit.
4. motor protective circuit according to claim 2, which is characterized in that the control switch be relay, it is described after
The normally opened contact of electric appliance is connected in parallel on the both ends of the fusing resistor, the control signal input of the relay and the master control mould
A wherein control signal output for block connects.
5. motor protective circuit according to claim 3, which is characterized in that the rectification circuit is a rectifier bridge.
6. motor protective circuit according to claim 1, which is characterized in that the motor-drive circuit generates the driving of three tunnels
Signal is simultaneously input to motor, and the sample circuit includes three sampling resistors, which connects one to one three
Between road driving signal output end and ground, the current sampling signal that three sampling resistors obtain is fed back to institute by the sample circuit
State motor-drive circuit.
7. motor protective circuit according to claim 6, which is characterized in that the sample circuit further includes the second filtered electrical
Road, second filter circuit are connected in parallel with the sampling resistor.
8. motor protective circuit according to claim 1-7, which is characterized in that the output end of the sample circuit
Operational amplifier circuit is also connected between the motor-drive circuit.
9. motor protective circuit according to claim 8, which is characterized in that the operational amplifier circuit includes with twin-channel
Operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820855875.3U CN208226558U (en) | 2018-06-04 | 2018-06-04 | A kind of motor protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820855875.3U CN208226558U (en) | 2018-06-04 | 2018-06-04 | A kind of motor protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208226558U true CN208226558U (en) | 2018-12-11 |
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ID=64507381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820855875.3U Active CN208226558U (en) | 2018-06-04 | 2018-06-04 | A kind of motor protective circuit |
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| Country | Link |
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| CN (1) | CN208226558U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556787A (en) * | 2018-06-04 | 2019-12-10 | 青岛海尔智能电子有限公司 | motor protection circuit and protection control method |
-
2018
- 2018-06-04 CN CN201820855875.3U patent/CN208226558U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556787A (en) * | 2018-06-04 | 2019-12-10 | 青岛海尔智能电子有限公司 | motor protection circuit and protection control method |
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