CN110247615A - Wave limiting control system, method and electric machine controller based on dsp chip - Google Patents
Wave limiting control system, method and electric machine controller based on dsp chip Download PDFInfo
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- CN110247615A CN110247615A CN201810195593.XA CN201810195593A CN110247615A CN 110247615 A CN110247615 A CN 110247615A CN 201810195593 A CN201810195593 A CN 201810195593A CN 110247615 A CN110247615 A CN 110247615A
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- 230000000670 limiting effect Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention belongs to insulated gate bipolar transistor actuation techniques fields, provide the control system and method for a kind of wave limiting based on digital signal processing chip, and for driving IGBT, control system includes current sampling circuit, comparison circuit and DSP governor circuit；Current sampling circuit exports sample rate current for sampling to the electric current of IGBT；Comparison circuit exports the first comparison result for comparing sample rate current and current limliting threshold value；DSP governor circuit includes: Pulse width modulation module, and PWM module is used for output pwm signal, for driving IGBT；Counting module, counting module is counted for compared result, and exports count value；First comparison module, the first comparison module export the second comparison result for comparing count value and default value；Faulty section (Trip Zone, TZ) module, TZ module with the second comparison result, control the output of PWM module according to the first comparison result.
Description
Technical field
The invention belongs to IGBT actuation techniques field more particularly to a kind of wave limiting control system based on dsp chip,
Method and electric machine controller.
Background technique
Many industries in motor application field, for motor in actual operational process, the load of motor can be when extremely short
Between mutate, if not active control electric current, it is possible that over-current phenomenon avoidance, but if reality can be not achieved again by reducing power
The functional requirement on border, such as when using motor control cutting stone material, run into harder position, needed in the short time
Very high current is provided, but the limit value of overcurrent protection cannot be reached.At this time, it may be necessary to carry out current limliting to electric current.
There are two types of currently used current-limiting methods, one is being sampled by DSP to electric current, and calculates as a result, again
Movement is judged according to calculated result, but the delay of this method is bigger, is only suitable for responding slow system；Another kind side
Method is to carry out impulse sealing to the pwm signal that DSP is issued, but IGBT will appear very high open pipe frequency, and IGBT has damage
Risk, and DSP cannot synchronize to obtain wave limiting signal.
Therefore, there is the risk that delay is bigger, IGBT has damage in traditional technical solution and DSP cannot synchronize to obtain
The problem of wave limiting signal.
Summary of the invention
The present invention provides a kind of wave limiting control system, method and electric machine controller based on dsp chip, it is intended to solve
The risk and DSP that delay is bigger present in certainly traditional technical solution, IGBT has damage cannot synchronize to obtain wave limiting
The problem of signal.
A method of the wave limiting based on dsp chip, for driving IGBT, which comprises
The operating current of the IGBT is sampled, and exports sample rate current；
Compare the sample rate current and current limliting threshold value；
If the sampled current value is less than the current limliting threshold value, control system is worked normally；
If the sampled current value is greater than the overcurrent threshold value, pwm signal is locked；
The sample rate current is periodically read, and records the count value that the sample rate current is greater than the overcurrent threshold value, and
Compare the size of the count value and default value；
If count value is greater than the default value, decision-making system over current fault, and it is described to reduce to adjust pwm signal
The operating current of IGBT；
If count value is less than the default value, pwm signal locking is released, control system works normally.
In addition, a kind of control system of wave limiting based on dsp chip is additionally provided, for driving IGBT, the control
System processed includes: current sampling circuit, comparison circuit and DSP governor circuit；
The current sampling circuit exports sample rate current for sampling to the electric current of the IGBT；
The comparison circuit is used for the sample rate current and current limliting threshold value, and exports the first comparison result；
The DSP governor circuit includes:
PWM module, the PWM module is used for output pwm signal, described for driving the IGBT；
Counting module, the counting module export count value for counting to the comparison result；
First comparison module, first comparison module is used for the count value and default value, and exports second
Comparison result；
TZ module, the TZ module control the PWM mould according to first comparison result and second comparison result
The output of block, in which:
In first comparison result: if the sampled current value is less than the current limliting threshold value, control system is just
Often work；If the sampled current value is greater than the current limliting threshold value, the pwm signal is locked；
In second comparison result: if count value is greater than the default value, decision-making system over current fault, and adjusting
The pwm signal is saved to reduce the operating current of the IGBT；If count value is less than the default value, pwm signal is released
Locking, control system work normally.
In addition, additionally provide a kind of electric machine controller, including IGBT and for driving, the IGBT's is above-mentioned based on DSP
The control system of the wave limiting of chip.
The control system of the above-mentioned wave limiting based on dsp chip, the sampling of sample circuit is compared by comparing circuit
Electric current and current limliting threshold value, the TZ module in DSP governor circuit judge the comparison result of comparison circuit, and according to comparing
As a result the output for controlling PWM module, can fast and safely reach wave limiting effect, avoid overcurrent protection, prevent from limiting by wave
Too frequent, HF switch IGBT is flowed, its damage is caused, and add up the time of current limliting by counting module, if within a certain period of time
More than preset value, drop power operation is carried out to PWM module, protection IGBT will not be damaged.
Detailed description of the invention
Fig. 1 is the control system architecture schematic diagram of the wave limiting provided in an embodiment of the present invention based on dsp chip；
Fig. 2 is the exemplary circuit principle of comparison circuit in the control system of the wave limiting shown in FIG. 1 based on dsp chip
Figure；
Fig. 3 is the wave limiting waveform of the control system of the wave limiting provided in an embodiment of the present invention based on dsp chip
Figure；
Fig. 4 is the specific flow chart of the method for the wave limiting provided in an embodiment of the present invention based on dsp chip.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, the present invention provides a kind of control systems of wave limiting based on dsp chip, for driving
IGBT, the system include: current sampling circuit 10, comparison circuit 20 and DSP governor circuit 30.
Wherein, current sampling circuit 10 is for sampling the electric current of IGBT, and exports sample rate current, the current sample
Electric current is common AD sampling, and the electric current at more both ends IGBT is sampled, the output size of current of sample rate current characterization circuit.
Comparison circuit 20 is connect with current sampling circuit 10 and DSP governor circuit 30 respectively, for compare sample rate current and
Current limliting threshold value, and export the first comparison result.Specifically, comparison circuit 20 includes comparator U1, first resistor R1, second
Resistance R2, first capacitor C1 and the second capacitor C2；The inverting input terminal of comparator U1 passes through first resistor R1 and current sample electricity
Road 10 connects, and the inverting input terminal of the first termination comparator U1 of first capacitor C1, the second end ground connection of first capacitor C1 is compared
The same phase access termination reference voltage of device U1, the output end of comparator U1 connect DSP governor circuit 30, the output end of comparator U1
DC voltage is connect by second resistance R2, the output end of the first termination comparator U1 of the second capacitor C2, the of the second capacitor C2
Two ends ground connection.Wherein, the first comparison result is the digital waveform of one or a set of multiple high and low level compositions.Work as sample rate current
When less than current limliting threshold value, the output end of comparator U1 exports high level, and DSP governor circuit 30 receives high level, control system
It works normally, when sample rate current is greater than current limliting threshold value, the output end of comparator U1 exports low level, the electric current at the both ends IGBT
Current limliting threshold value is reached, has needed to carry out current limliting to output electric current, at this point, the pwm signal of 30 pairs of DSP governor circuit output carries out
Locking.
DSP governor circuit 30 includes PWM module 32, counting module 33, the first comparison module 34 and TZ module 31；Wherein,
PWM module 32 is connect with TZ module 31, output pwm signal is used for, for driving IGBT；Counting module 33 and TZ module 31 connect
It connects, for counting to the first comparison result, and exports count value；First comparison module 34 and counting module 33 and TZ module
31 connections for comparing count value and default value, and export the second comparison result；TZ module 31 and comparison circuit 20 and first
Comparison module 34 connects, and according to the first comparison result with the second comparison result, controls the output of PWM module 32.
TZ module 31 receive comparison circuit 20 export the first comparison result, when sample rate current be less than current limliting threshold value, i.e.,
When first comparison result is high level, TZ module 31 controls PWM module 32 and normally exports, when sample rate current is greater than current limliting threshold value
When, counting module 33 counts the low level number of the first comparison result, so that calculating output electric current is greater than current limliting thresholding
The time of value, when the count value that counting module 33 exports is greater than default value, then it is assumed that system current limliting overlong time determines system
System over current fault reduces the output power of PWM module 32, when the count value that counting module 33 exports is less than default value, TZ mould
Block 31 controls PWM module 32 and normally exports.In actual application, directly the TZ register in DSP can be configured,
Realize the function of TZ module 31, specifically, the GPIO16 pin of configuration DSP governor circuit is TZ function foot, works as sample rate current
When reaching current limliting threshold value, TZ function foot is that low level is effective, blocks the output of PWM module, when output electric current is lower than threshold value,
TZ5 pin is that high level is invalid, and PWM module normally exports.
Export electric current it is excessive when, to prevent circuit system to be burned, DSP governor circuit 30 further includes second comparing mould
Block, the second comparison module are connect with current sampling circuit 10, for comparing sample rate current and overcurrent threshold value, when sample rate current is big
When overcurrent threshold value, system over current fault is judged, reduce the output power of PWM module 32, when output electric current is excessive, directly
The output of PWM module 32 is controlled, is not required to handle by current limliting, prevents high current from circuit system being caused to be burned.
Further, control system further includes multiple selector, and multiple selector is connect with PWM module 32, for PWM mould
The pwm signal that block 32 exports carries out output channel selection, corresponding, and comparison circuit 20 can also have multiple, can pass through one
DSP governor circuit 30 is selected and is controlled to multiple IGBT simultaneously, and the versatility of control system is enhanced.
As shown in figure 3, being being limited by wave for the control system of the wave limiting provided in an embodiment of the present invention based on dsp chip
Waveform diagram is flowed, wherein I represents the operating current waveform of IGBT, and V represents the level waveforms of comparison circuit output.
In addition, additionally provide a kind of electric machine controller, which includes IGBT and for driving the IGBT
The control system of the above-mentioned wave limiting based on dsp chip.
As shown in figure 4, the present invention also provides a kind of methods of wave limiting based on dsp chip, for driving IGBT,
Method includes the following steps:
S100 samples the operating current of IGBT, and exports sample rate current；
S200 compares sample rate current and current limliting threshold value.
S300, if sampled current value is less than overcurrent threshold value, control system is worked normally.
S400 locks pwm signal, and periodically read sampled current value if sampled current value is greater than overcurrent threshold value, and
The sample count values that sampled current value is greater than current limliting threshold value are recorded, and compare the big of sample count values and default maximum count value
It is small.
Specifically, when sample rate current is less than current limliting threshold value, the output end of comparator exports high level, DSP master control
Circuit 30 receives high level, and control system works normally, and when sample rate current is greater than current limliting threshold value, the output end of comparator is defeated
Low level out, the electric current at the both ends IGBT have reached current limliting threshold value, need to carry out current limliting to output electric current, at this point, DSP master control electricity
The pwm signal of the 30 pairs of outputs in road locks.
S500 if count value is greater than default value, decision-making system over current fault, and adjusts pwm signal to reduce IGBT
Operating current；If count value is less than default value, pwm signal locking is released, control system works normally.
Wherein, the sample rate current is periodically read, and records the counting that the sample rate current is greater than the overcurrent threshold value
The step of value includes: the regular level value for reading detection pin；Record detection pin is low level number, as count value.
Specifically, periodically read TZ module detection pin level value, when sample rate current be less than current limliting threshold value, i.e.,
When first comparison result is high level, TZ module 31 controls PWM module 32 and normally exports, when sample rate current is greater than current limliting threshold value
When, counting module 33 counts the low level number of the first comparison result, so that calculating output electric current is greater than current limliting thresholding
The time of value, when the count value that counting module 33 exports is greater than default value, then it is assumed that system current limliting overlong time determines system
System over current fault reduces the output power of PWM module 32, when the count value that counting module 33 exports is less than default value, TZ mould
Block 31 controls PWM module 32 and normally exports.Wherein, sampled current value is periodically read, and records sampled current value greater than overcurrent door
The sample count of limit value is specifically includes the following steps: periodically read the level value of detection pin；Record detection pin is low level
Number count value.And sample count is preset with the sampling time, and if not adding up in sampling time count value, count value
It resets, prepares for sample count next time.
Further, further comprising the steps of before relatively sampled value and current limliting threshold value:
Compare the size of sampled current value Yu overcurrent threshold value, if sampled current value be greater than overcurrent threshold value, determine be
System over current fault, locks pwm signal；If sampled current value is less than overcurrent threshold value, S200 is entered step.It is big in sample rate current
When overcurrent threshold value, overcurrent protection directly is carried out to system, the output power of pwm signal is reduced, directly carried out stream process,
Prevent high current from circuit system being caused to be burned.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of method of the wave limiting based on dsp chip, for driving IGBT, which is characterized in that the described method includes:
The operating current of the IGBT is sampled, and exports sample rate current；
Compare the sample rate current and current limliting threshold value；
If the sampled current value is less than the current limliting threshold value, control system is worked normally；
If the sampled current value is greater than the overcurrent threshold value, pwm signal is locked；
The sample rate current is periodically read, and records the count value that the sample rate current is greater than the current limliting threshold value, and compare
The size of the count value and default value；
If count value is greater than the default value, decision-making system over current fault, and adjusts pwm signal to reduce the IGBT's
Operating current；
If count value is less than the default value, pwm signal locking is released, control system works normally.
2. the method for the wave limiting based on dsp chip as described in claim 1, which is characterized in that described in the comparison
Before the step of sample rate current and the current limliting threshold value, further includes:
Compare the size of the sample rate current Yu overcurrent threshold value；
If the sample rate current is greater than the overcurrent threshold value, decision-making system over current fault locks pwm signal.
3. the method for the wave limiting based on dsp chip as described in claim 1, which is characterized in that the regular reading institute
Sample rate current is stated, and the step of recording count value of the sample rate current greater than the overcurrent threshold value includes:
Periodically read the level value of detection pin；
Record detection pin is low level number, as count value.
4. the method for the wave limiting based on dsp chip as described in claim 1, which is characterized in that sample count is preset with
In the sampling time, if the count value does not add up in the sampling time, the count value is reset.
5. a kind of control system of the wave limiting based on dsp chip, for driving IGBT, which is characterized in that the control system
System includes: current sampling circuit, comparison circuit and DSP governor circuit；
The current sampling circuit exports sample rate current for sampling to the electric current of the IGBT；
The comparison circuit is used for the sample rate current and current limliting threshold value, and exports the first comparison result；
The DSP governor circuit includes:
PWM module, the PWM module is used for output pwm signal, described for driving the IGBT；
Counting module, the counting module export count value for counting to first comparison result；
First comparison module, first comparison module are used for the count value and default value, and export second and compare
As a result；
TZ module, the TZ module control the PWM module according to first comparison result and second comparison result
Output, in which:
In first comparison result: if the sampled current value is less than the current limliting threshold value, the normal work of control system
Make；If the sampled current value is greater than the current limliting threshold value, the pwm signal is locked；
In second comparison result: if count value is greater than the default value, decision-making system over current fault, and adjusting institute
Pwm signal is stated to reduce the operating current of the IGBT；If count value is less than the default value, pwm signal locking is released,
Control system works normally.
6. the control system of the wave limiting based on dsp chip as claimed in claim 5, which is characterized in that the comparison is electric
Road includes comparator, first resistor, second resistance, first capacitor and the second capacitor；The inverting input terminal of the comparator passes through
The first resistor is connect with the current sampling circuit, the anti-phase input of the first termination comparator of the first capacitor
The same phase access at end, the second end ground connection of the first capacitor, the comparator is terminated into the current limliting threshold value, the comparison
The output end of device connects the TZ module, and the output end of the comparator connects DC voltage by the second resistance, and described the
The output end of the first termination comparator of two capacitors, the second end ground connection of second capacitor.
7. the control system of the wave limiting based on dsp chip as claimed in claim 5, which is characterized in that further include multichannel
Selector, the multiple selector are connect with the PWM module, carry out channel selecting for the output to the PWM module.
8. the control system of the wave limiting based on dsp chip as claimed in claim 5, which is characterized in that the DSP master control
Circuit further includes the second comparison module, and second comparison module is connect with the current sampling circuit, for adopting described in comparison
Sample electric current and overcurrent threshold value.
9. the control system of the wave limiting based on dsp chip as claimed in claim 5, which is characterized in that first ratio
Relatively result is the digital waveform of one or a set of multiple high and low level compositions.
10. a kind of electric machine controller, which is characterized in that including IGBT and for drive the IGBT such as claim 5 to 9 times
The control system of wave limiting based on dsp chip described in one.
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| CN201810195593.XA CN110247615B (en) | 2018-03-09 | 2018-03-09 | Wave-by-wave current limiting control system and method based on DSP chip and motor controller |
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Cited By (1)
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| CN114123107A (en) * | 2021-11-30 | 2022-03-01 | 中汽创智科技有限公司 | Control system and method for vehicle motor, storage medium and vehicle with system |
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| CN110247615B (en) | 2024-04-12 |
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