CN204012661U - A kind of motor driving protection circuit - Google Patents
A kind of motor driving protection circuit Download PDFInfo
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- CN204012661U CN204012661U CN201420281029.7U CN201420281029U CN204012661U CN 204012661 U CN204012661 U CN 204012661U CN 201420281029 U CN201420281029 U CN 201420281029U CN 204012661 U CN204012661 U CN 204012661U
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Abstract
The utility model discloses a kind of motor driving protection circuit; this motor driving protection circuit is by the output of hardware fault output and the output current of IPM driver module of the hardware check function of IPM driver module self inside; control the driving situation of motor; when IPM driver module hardware check result, think and break down or output current occurs when abnormal; directly control level modular converter quits work; IPM driver module is not worked; and then cut-out motor, play the effect that motor drives protection.By the output current duplicate protection of hardware check function and IPM driver module, greatly improved the reliability of this motor driving protection circuit.
Description
Technical field
The utility model relates to motor and drives field, is specifically related to a kind of motor driving protection circuit.
Background technology
IPM (Intelligent Power Module), Intelligent Power Module, not only integrates device for power switching and drive circuit.And inside is also integrated with overvoltage, overcurrent and the failure detector circuit such as overheated, and detection signal can be delivered to CPU.It consists of the tube core of high-speed low-power-consumption and the gate drive circuit of optimization and fast protection circuit.Even if there is load accident situation or improper use, also can guarantee that IPM self is not damaged.IPM is generally used IGBT as power switch component, inner integrated current sensors and drive circuit.IPM is with its high reliability, easy to usely wins increasing market, is particularly suitable for frequency converter and the various inverter of drive motors, frequency control, metallurgical machinery, electric traction, servo-drive, a kind of ideal power electronic device of frequency-conversion domestic electric appliances.
IPM compares and has more defencive function with the assembly of IGBT module and drive circuit in the past, specific as follows:
(1) include overcurrent protection, short-circuit protection.Owing to realizing protection by detecting each IGBT collector current, thus abnormal no matter which IGBT occurs, can protect, particularly descend the protection of bridgc arm short and shorted to earth.
(2) include driving power under voltage protection.Each drive circuit has under-voltage protection function.When driving power voltage is less than setting when under-voltage, produce under voltage protection.
(3) include overtemperature protection.Overtemperature protection is to prevent the overheated defencive function of IGBT, FRD (fast recovery diode).On the insulated substrate of IPM inside, there is no detector unit, detect insulated substrate temperature.IPM is further provided with detector unit in each igbt chip, for the abnormal heating energy realization of High Speed overtemperature protection of chip.
(4) include hardware fault output port (F0).F0 is a kind of function to outside output fault alarm, when overheated and lower brachium pontis overcurrent, under-voltage protection action, and by the microcomputer output abnormality signal to controlling IPM, can practical halt system.During fault-free, the output level of F0 is high level, and while having fault, the output level of F0 is low level.
How existing motor driving protection circuit directly utilizes the hardware check function of IPM driver module to carry out motor and drives protection, owing to only adopting a road, once this self-checking function lost efficacy, cannot complete and drive protection, causes the poor reliability of protective circuit.
Utility model content
For the deficiencies in the prior art, the utility model provides a kind of motor driving protection circuit.
A motor driving protection circuit, comprises the DSP processing module, level switch module and the IPM driver module that connect successively, and DSP processing module is used for exporting pwm control signal; Level switch module is for carrying out level conversion to described pwm control signal; IPM driver module is for controlling motor operation according to the output signal of level switch module;
Also comprise:
Current sample module, obtains corresponding voltage signal for gathering the output current of IPM driver module;
Voltage comparison module, for being converted into level signal by described voltage signal;
NOR gate circuit, the input of NOR gate circuit is connected with the hardware fault output port of the output of voltage comparison module and IPM driver module, and the output of NOR gate circuit is connected with the Enable Pin of level switch module.
The utility model is by the hardware check function of IPM driver module self inside and the output current of IPM driver module (being the drive current of motor); control the driving situation of motor; when the hardware check result of IPM driver module, think and break down (being that hardware fault output port is output as low level) or output current occurs when abnormal; directly control level modular converter quits work; thereby IPM driver module is not worked; and then cut-out motor, play the effect that motor drives protection.Output current by hardware check function and IPM driver module drives and carries out duplicate protection motor, has greatly improved the reliability of this motor driving protection circuit.
DSP processing module adopts dsp chip to realize, and because the driving force of dsp chip is limited, therefore for can control IPM driver module, need to promote its driving force by level switch module.And the voltage signal obtaining due to current sample module is cosine signal; in order to utilize this voltage signal to complete the control to level switch module; reach and by output current, motor is driven the object of protecting, by voltage comparison module, voltage signal is converted into level signal (square-wave signal).
Described DSP processing module is also connected with the output of current sample module, for exporting corresponding pwm control signal according to described voltage signal.
The voltage signal that current sample module is collected feeds back to DSP processing module, utilizes the data-handling capacity of DSP processing module, according to the voltage signal of feedback, exports corresponding pwm control signal, and then controls motor operating state.When there is overcurrent condition, DSP processing module stops exporting pwm control signal, and to protect motor not to be damaged, this detects as the detection of software closed loop.
Described DSP processing module is exported 6 road pwm control signals.
Described DSP processing module comprises TMS320F28232 chip, and the TZ pin of described TMS320F28232 chip is connected with the hardware fault output port of IPM driver module.
The TZ pin of TMS320F28232 chip is the failure capture end of TMS320F28232 chip, and when the level of TZ pin is high level, TMS320F28232 chip just can be exported pwm control signal, otherwise, stop exporting pwm control signal.
As preferably, between described level switch module and IPM driver module, be also provided with optical couple isolation drive circuit.By optical couple isolation drive circuit, suppress noise jamming, improve control precision.
The voltage signal of described current sample module output is 3.
Motor is driven by three-phase electricity, and current sample module is converted into voltage signal by drive current, and because motor drive current is conventionally larger, current sample module is dwindled according to certain linear scale the current signal collecting transform and obtained corresponding voltage signal.There is the phase difference of 120 degree in the electric current in three-phase electricity between every two-phase, the magnitude of voltage of the voltage signal that synchronization is corresponding is different, therefore for improving the accuracy of controlling, need detect three-phase current signal simultaneously, after current sample module, obtain respectively three voltage signals, the corresponding voltage signal of U is IU, and the corresponding voltage signal of V is IV, and the corresponding voltage signal of W is IW.Accordingly, TMS320F28232 chip is provided with three AD mouths, and each AD mouth receives a voltage signal.
Described voltage comparison module has 3 independently voltage comparators, and 3 voltage signals are input to respectively corresponding voltage comparator.
The reference voltage of described voltage comparison module is 0V and 3V.
While only having three-phase normal output simultaneously, motor can normally be worked, and therefore need to compare each corresponding voltage signal.Jiang San road voltage signal is input to respectively in corresponding voltage comparator, and cosine signal is converted into square-wave signal, and corresponding voltage comparison module has three outputs, corresponds respectively to the output of each voltage comparator.The reference voltage of three voltage comparators is identical, and low level reference voltage is 0V, and high level reference voltage is 3V.The voltage signal that the U phase current sampling of take is corresponding is example:
Work as IU>3V, voltage comparator output low level (extremely),
Work as IU<0V, voltage comparator output low level (extremely),
As 0V≤IU≤3V, voltage comparator output high level (normally).
Can find out, at IU, occur when abnormal, voltage comparator output low level, when normal, output high level signal.IV and IW are in like manner.
Motor driving protection circuit of the present utility model is controlled the driving situation of motor by the hardware check function of IPM driver module self inside and the output current of IPM driver module; when IPM driver module hardware check result, think and break down or output current occurs when abnormal; directly control level modular converter quits work; thereby IPM driver module is not worked; and then cut-out motor, play the effect that motor drives protection.By the output current duplicate protection of hardware check function and IPM driver module, greatly improved the reliability of this motor driving protection circuit.
Accompanying drawing explanation
Fig. 1 is the structure chart of the motor driving protection circuit of the present embodiment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
The motor driving protection circuit of the present embodiment, as shown in Figure 1, comprises the DSP processing module, level switch module and the IPM driver module that connect successively, and DSP processing module is used for exporting pwm control signal; Level switch module is for carrying out level conversion to pwm control signal; IPM driver module is for operating according to the control motor of the output signal of level switch module;
Current sample module, obtains corresponding voltage signal for gathering the output current of IPM driver module;
Voltage comparison module, for being converted into level signal by voltage signal;
NOR gate circuit, the input of NOR gate circuit is connected with the hardware fault output port of the output of voltage comparison module and IPM driver module, and its output is connected with the Enable Pin of level switch module.
In the present embodiment, DSP processing module comprises TMS320F28232 chip, and the TZ pin of this TMS320F28232 chip is connected with the hardware fault output port of IPM driver module.DSP processing module is exported 6 road pwm control signals, is respectively PWM1, PWM2, PWM3, PWM4, PWM5 and PWM6.
In the present embodiment, level switch module is realized based on 74HC367 chip, and the Enable Pin of this chip is OE end, and when OE end is low level, 74HC367 chip is normally worked, otherwise does not work.IPM driver module is realized based on PS21767 chip, and the F0 pin of this chip is output as high level explanation, IPM driver module fault-free, and F0 pin is output as low level, illustrates that IPM driver module has fault.
The EPWM1A of TMS320F28232 chip, EPWM1B, EPWM2A, EPWM2B, EPWM3A, EPWM3B pin corresponding 1A, 2A, 3A, 4A, 5A, the 6A pin of receiving 74HC367 respectively in the present embodiment, after 74HC367 chip level conversion, by 1Y, 2Y, 3Y, 4Y, 5Y, 6Y pin, export, receive respectively WP, WN, VP, VN, UP, the UN pin of PS21767 chip.
In the present embodiment, current sample module gathers the electric current of each phase, and the electric current of each phase to be converted into voltage signal be respectively 3.Corresponding current sample module has 3 outputs, and each output is used for exporting corresponding voltage signal.Each voltage signal is input to respectively corresponding AD interface on TMS320F28232 chip (a corresponding AD interface of voltage signal).DSP processing module is also connected with the output of current sample module, for export corresponding pwm control signal according to voltage signal.On the other hand, voltage comparison module has 3 independently voltage comparators, and each voltage signal is input to corresponding voltage comparator, and through comparator effect, the voltage signal that current sample module is collected is converted into square-wave signal (low and high level).
The output of F0 pin and the output of voltage comparison module of TMS320F28232 chip are carried out corresponding logical calculated by NOR gate circuit.The chip that in the present embodiment, NOR gate circuit is used is 74LS30, this chip is 8 road signal inputs, one tunnel level signal output, the wherein 4 road signal inputs of 74LS30 in the present embodiment, have been used, be connected with the output of F0 pin and the output of voltage comparison module respectively, remaining 4 tunnels all connect high level, logical calculated result (output of NOR gate circuit) accesses the Enable Pin (being the OE end of 74HC367 chip) of level switch module, utilizes the working condition of result of calculation control level modular converter:
When three outputs of the F0 of TMS320F28232 chip pin and comparison module are all exported high level, the signal of NOR gate circuit output is just low level, and now the Enable Pin OE of level transferring chip is low level, and level switch module could normal output.In three outputs of the F0 of TMS320F28232 chip pin and comparison module, there are one or more output low levels when (comprising whole output low levels), NOR gate circuit output is just high level, now the Enable Pin OE of level transferring chip is high level, level switch module stops output, pwm control signal can not be input to IPM driver module, and motor quits work.
For improving control precision, between level switch module and IPM driver module, be also provided with optical couple isolation drive circuit (not shown in FIG.), effectively suppress to disturb.
Above-described embodiment has been described in detail the technical solution of the utility model and beneficial effect; be understood that and the foregoing is only most preferred embodiment of the present utility model; be not limited to the utility model; all any modifications of making within the scope of principle of the present utility model, supplement and be equal to replacement etc., within all should being included in protection range of the present utility model.
Claims (8)
1. a motor driving protection circuit, comprises the DSP processing module, level switch module and the IPM driver module that connect successively, and DSP processing module is used for exporting pwm control signal; Level switch module is for carrying out level conversion to described pwm control signal; IPM driver module is for controlling motor operation according to the output signal of level switch module;
It is characterized in that, also comprise:
Current sample module, obtains corresponding voltage signal for gathering the output current of IPM driver module;
Voltage comparison module, for being converted into level signal by described voltage signal;
NOR gate circuit, the input of NOR gate circuit is connected with the hardware fault output port of the output of voltage comparison module and IPM driver module, and the output of NOR gate circuit is connected with the Enable Pin of level switch module.
2. motor driving protection circuit as claimed in claim 1, is characterized in that, described DSP processing module is also connected with the output of current sample module, for exporting corresponding pwm control signal according to described voltage signal.
3. motor driving protection circuit as claimed in claim 2, is characterized in that, described DSP processing module is exported 6 road pwm control signals.
4. motor driving protection circuit as claimed in claim 3, is characterized in that, described DSP processing module comprises TMS320F28232 chip, and the TZ pin of described TMS320F28232 chip is connected with the hardware fault output port of IPM driver module.
5. the motor driving protection circuit as described in any one claim in claim 1～4, is characterized in that, between described level switch module and IPM driver module, is also provided with optical couple isolation drive circuit.
6. motor driving protection circuit as claimed in claim 5, is characterized in that, the voltage signal of described current sample module output is 3.
7. motor driving protection circuit as claimed in claim 6, is characterized in that, described voltage comparison module has 3 independently voltage comparators, and 3 voltage signals are input to respectively corresponding voltage comparator.
8. motor driving protection circuit as claimed in claim 7, is characterized in that, the reference voltage of described voltage comparison module is 0V and 3V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420281029.7U CN204012661U (en) | 2014-05-28 | 2014-05-28 | A kind of motor driving protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420281029.7U CN204012661U (en) | 2014-05-28 | 2014-05-28 | A kind of motor driving protection circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535798A (en) * | 2014-12-29 | 2015-04-22 | 苏州中盛纳米科技有限公司 | Acceleration sensor batch rolling platform control system and method |
| CN105278525A (en) * | 2015-11-13 | 2016-01-27 | 兰州飞行控制有限责任公司 | Parallel steering engine drive circuit with fault monitoring function |
| CN106130332A (en) * | 2016-07-19 | 2016-11-16 | 合肥联信电源有限公司 | A kind of emergency power supply high-power IGBT current foldback circuit |
| CN108173241A (en) * | 2018-02-05 | 2018-06-15 | 珠海格力电器股份有限公司 | Protection circuit of IPM module |
| CN109659908A (en) * | 2018-12-27 | 2019-04-19 | 福建睿能科技股份有限公司 | A kind of protection circuit and motor driver |
| CN109799721A (en) * | 2019-01-31 | 2019-05-24 | 海信（山东）空调有限公司 | A kind of control circuit of household electrical appliance, control method and household electrical appliance |
| CN110289598A (en) * | 2019-06-27 | 2019-09-27 | 中国电力科学研究院有限公司 | A kind of comprehensive protector and method applied to full bridge inverter |
| CN113193539A (en) * | 2021-05-25 | 2021-07-30 | 中科新松有限公司 | Motor drive protection circuit |
-
2014
- 2014-05-28 CN CN201420281029.7U patent/CN204012661U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535798A (en) * | 2014-12-29 | 2015-04-22 | 苏州中盛纳米科技有限公司 | Acceleration sensor batch rolling platform control system and method |
| CN105278525A (en) * | 2015-11-13 | 2016-01-27 | 兰州飞行控制有限责任公司 | Parallel steering engine drive circuit with fault monitoring function |
| CN106130332A (en) * | 2016-07-19 | 2016-11-16 | 合肥联信电源有限公司 | A kind of emergency power supply high-power IGBT current foldback circuit |
| CN108173241A (en) * | 2018-02-05 | 2018-06-15 | 珠海格力电器股份有限公司 | Protection circuit of IPM module |
| CN109659908A (en) * | 2018-12-27 | 2019-04-19 | 福建睿能科技股份有限公司 | A kind of protection circuit and motor driver |
| CN109799721A (en) * | 2019-01-31 | 2019-05-24 | 海信（山东）空调有限公司 | A kind of control circuit of household electrical appliance, control method and household electrical appliance |
| CN109799721B (en) * | 2019-01-31 | 2021-12-14 | 海信（山东）空调有限公司 | Control circuit and control method of household appliance and household appliance |
| CN110289598A (en) * | 2019-06-27 | 2019-09-27 | 中国电力科学研究院有限公司 | A kind of comprehensive protector and method applied to full bridge inverter |
| CN110289598B (en) * | 2019-06-27 | 2022-09-20 | 中国电力科学研究院有限公司 | Comprehensive protection device and method applied to full-bridge inverter circuit |
| CN113193539A (en) * | 2021-05-25 | 2021-07-30 | 中科新松有限公司 | Motor drive protection circuit |
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