CN109067307B - Temperature detection and protection method, system and device of motor drive circuit and motor protection system - Google Patents
Temperature detection and protection method, system and device of motor drive circuit and motor protection system Download PDFInfo
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- CN109067307B CN109067307B CN201810732200.4A CN201810732200A CN109067307B CN 109067307 B CN109067307 B CN 109067307B CN 201810732200 A CN201810732200 A CN 201810732200A CN 109067307 B CN109067307 B CN 109067307B
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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
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0853—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load specially adapted for motors rotating in both directions
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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Abstract
The invention belongs to the technical field of temperature detection, and provides a method, a system and a device for detecting and protecting the temperature of a motor driving circuit and a motor protection system; the motor drive circuit includes: the device comprises a direct current power supply, a driving circuit and a sampling resistor; the upper bridge arm and the lower bridge arm of each phase of the driving circuit respectively comprise a power switch tube; wherein the temperature detection and protection method comprises: sampling instantaneous operating current of each phase through internal resistance of a power switch tube of each phase bridge arm to obtain first phase current, sampling operating current of a direct current bus through a sampling resistor to obtain second phase current, calculating and filtering the first phase current and the second phase current to obtain a detection current value, and judging whether the power switch tube is in an over-temperature state or not according to the detection current value; if the power switch tube is in an over-temperature state, an over-temperature protection signal is sent to the power switch tube; the invention can solve the problem that the traditional technology can not accurately detect the internal temperature of the power switch tube in the motor driving circuit.
Description
Technical Field
The invention belongs to the technical field of temperature detection, and particularly relates to a temperature detection and protection method, system and device of a motor drive circuit and a motor protection system.
Background
The motor is a commonly used electronic component in an existing electronic circuit, in order to control the operation and stop of the motor, technicians generally adopt a motor driving circuit to input a power supply to the motor, so that the real-time control on the starting and stopping of the motor is realized, and the motor is connected with electric energy through the motor driving circuit; if the motor driving circuit is disconnected, the motor loses power and stops working, and if the motor driving circuit is conducted, the motor is accessed with electric energy to keep a normal running state; therefore, the motor driving circuit plays an extremely important role in controlling the running state of the motor.
In the existing motor driving circuit, technicians mainly realize the on-off of the motor driving circuit through a power switch tube to control whether a motor is connected with a driving current or not, and because the motor needs to be connected with high-power electric energy through the motor driving circuit in the running process, the motor driving circuit has high-power running current, so the temperature of the power switch tube in the motor driving circuit can be rapidly increased due to the heating of the current; however, in the conventional technology, since the circuit structure of the motor driving circuit is complicated, a technician cannot accurately detect the internal temperature of the power switching tube in the motor driving circuit through the temperature detection device; or although the technician detects the temperature of the power switching tube through the temperature detection device in the motor driving circuit, the temperature detection device occupies a larger space of the circuit, so that the circuit structure of the motor driving circuit is more complicated, the temperature detection precision of the power switching tube is low, and great inconvenience is brought to the use of the motor.
Disclosure of Invention
The invention provides a temperature detection and protection method, a temperature detection and protection system, a temperature detection and protection device and a motor protection system for a motor drive circuit, and aims to solve the problems that when the temperature of a power switch tube is detected by the motor drive circuit through installing a temperature detection device in the traditional technology, the circuit structure of the motor drive circuit is complex, the internal temperature of the power switch tube in the motor drive circuit is difficult to accurately detect, and the motor is inconvenient to use.
A first aspect of the present invention provides a method for detecting and protecting a temperature of a motor driving circuit, the motor driving circuit including: a DC power supply for outputting electrical energy; the driving circuit is used for driving the motor to operate according to the driving signal, and each phase of upper and lower bridge arms of the driving circuit respectively comprise a power switch tube; and a sampling resistor connected between the DC power supply and the drive circuit; the temperature detection and protection method comprises the following steps:
sampling each phase of instantaneous running current through the internal resistance of the power switch tube of each phase of bridge arm to obtain a first phase current;
sampling the running current of the direct current bus through the sampling resistor to obtain a second phase current;
calculating to obtain a current ratio according to the first phase current and the second phase current;
filtering the current ratio to obtain a detection current value;
and judging whether the temperature of the power switch tube is in an over-temperature state or not according to the detected current value, and if the power switch tube is in the over-temperature state, sending an over-temperature protection signal.
In one embodiment, the calculating the current ratio according to the first phase current and the second phase current includes:
the calculation formula of the current ratio is as follows:
k＝imos/ibus；
in the above equation, k is the current ratio, imos is the first phase current, and ibus is the second phase current.
In one embodiment, the determining whether the temperature of the power switching tube is in an over-temperature state according to the detected current value specifically includes:
calculating a normal current threshold value according to preset parameters and the first phase current;
calculating an actual difference value between the detected current value and the normal current threshold value;
and when the actual difference value is larger than a preset difference value, determining that the power switch tube is in an over-temperature state.
In one embodiment, before calculating the current ratio between the first phase current and the second phase current, the temperature detection and protection method further comprises:
converting the first phase current and the second phase current from analog signals to digital signals.
A second aspect of the present invention provides a temperature detection and protection system of a motor drive circuit, the motor drive circuit including: a DC power supply for outputting electrical energy; the driving circuit is used for driving the motor to operate according to the driving signal, and each phase of upper and lower bridge arms of the driving circuit respectively comprise a power switch tube; and a sampling resistor connected between the DC power supply and the drive circuit; the temperature detection and protection system includes:
the first current sampling unit is used for sampling each phase of instantaneous running current through the internal resistance of the power switching tube of each phase of bridge arm to obtain a first phase current;
the second current sampling unit is used for sampling the running current of the direct current bus through the sampling resistor to obtain a second phase current;
the current ratio calculation unit is used for calculating a current ratio according to the first phase current and the second phase current;
the filtering processing unit is used for filtering the current ratio to obtain a detection current value;
and the temperature judging unit is used for judging whether the temperature of the power switch tube is in an over-temperature state or not according to the detected current value, and if the power switch tube is in the over-temperature state, sending an over-temperature protection signal.
In one embodiment, in the current ratio calculation unit, the current ratio is calculated by the following formula:
k＝imos/ibus；
in the above equation, k is the current ratio, imos is the first phase current, and ibus is the second phase current.
In one embodiment, the temperature determination unit includes:
the parameter setting module is used for calculating a normal current threshold value according to preset parameters and the first phase current;
the difference value calculation module is used for calculating the actual difference value of the detection current value and the normal current threshold value;
and the over-temperature identification module is used for determining that the power switch tube is in an over-temperature state and sending out the over-temperature protection signal when the actual difference value is larger than a preset difference value.
In one embodiment, the method further comprises:
and the signal conversion unit is used for converting the first phase current and the second phase current from analog signals into digital signals.
A third aspect of the present invention provides a temperature detection and protection device for a motor drive circuit, the motor drive circuit including: a DC power supply for outputting electrical energy; the driving circuit is used for driving the motor to operate according to the driving signal, and each phase of upper and lower bridge arms of the driving circuit respectively comprise a power switch tube; and a sampling resistor connected between the DC power supply and the drive circuit; the temperature detection and protection device includes: a first current receiver, a second current receiver, a memory, a processor, and a computer program stored in the memory and executable on the processor;
the first current receiver is used for receiving a first phase current, wherein the first phase current is obtained by sampling each phase of instantaneous operating current through the internal resistance of the power switch tube of each phase of bridge arm;
the second current receiver is used for receiving a second phase current, wherein the second phase current is obtained by sampling the running current of the direct current bus through the sampling resistor;
the processor calls the computer program for performing the steps of:
calculating to obtain a current ratio according to the first phase current and the second phase current;
filtering the current ratio to obtain a detection current value;
and judging whether the temperature of the power switch tube is in an over-temperature state or not according to the detected current value, and if the power switch tube is in the over-temperature state, sending an over-temperature protection signal.
A fourth aspect of the invention provides a motor protection system comprising a temperature detection and protection device of a motor drive circuit as described above.
In the temperature detection and protection method of the motor driving circuit, the internal resistance of the power switch tube of each phase bridge arm is used for sampling each phase of instantaneous running current to obtain a first phase current, the sampling resistance is used for sampling the current of the direct current bus to obtain a second phase current, and further, the temperature inside the power switch tube in the motor driving circuit can be accurately detected after the first phase current and the second phase current are calculated and filtered, so that the operation process is simple, and the temperature detection precision is high; in the temperature detection and protection method, instantaneous operating current of each phase is directly sampled through the internal resistance of the power switch tube, an additional temperature detection device is not needed, the circuit structure of the motor driving circuit is simplified, and technicians can use the motor more conveniently; therefore, the problems that when the temperature of the power switch tube is detected by the motor driving circuit through the temperature detection device in the traditional technology, the circuit structure of the motor driving circuit is complex, the internal temperature detection precision of the power switch tube is not high, and the motor is inconvenient to use are effectively solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit configuration diagram of a motor drive circuit according to an embodiment of the present invention;
fig. 2 is a flowchart of an implementation of a method for detecting and protecting a temperature of a motor driving circuit according to an embodiment of the present invention;
fig. 3 is a specific flowchart for determining whether the temperature of the power switching tube is in an over-temperature state according to the detected current value according to the embodiment of the present invention;
fig. 4 is a flowchart of another implementation of a temperature detection and protection method for a motor driving circuit according to an embodiment of the present invention;
fig. 5 is a block diagram of a temperature detection and protection system of a motor driving circuit according to an embodiment of the present invention;
fig. 6 is a block diagram of a temperature determination unit according to an embodiment of the present invention;
fig. 7 is a block diagram of another temperature detection and protection system for a motor drive circuit according to an embodiment of the present invention;
fig. 8 is a block diagram of a temperature detection and protection apparatus for a motor driving circuit according to an embodiment of the present invention;
fig. 9 is a block diagram of a motor protection system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, in the field of the technology, a skilled person may use various motor driving circuits to control the motor, specifically, a conventional motor driving circuit usually uses a driving circuit to control the forward rotation and the reverse rotation of the motor; as an alternative implementation, fig. 1 shows a circuit structure diagram of a motor driving circuit 10 according to an embodiment of the present invention, and as shown in fig. 1, the motor driving circuit 10 includes: the motor M comprises a direct current power supply Vcc, a driving circuit 101 and a sampling resistor R, wherein the direct current power supply Vcc can output electric energy which can drive the motor M to work; the driving circuit 101 drives the motor to operate according to a driving signal D, the driving circuit 101 includes an upper bridge arm 102 and a lower bridge arm 103 of each phase, the upper bridge arm 102 and the lower bridge arm 103 respectively include power switching tubes, specifically, the upper bridge arm 102 includes a first power switching tube M1, a second power switching tube M2 and a third power switching tube M3, the lower bridge arm 103 includes a fourth power switching tube M4, a fifth power switching tube M5 and a sixth power switching tube M6, a power input end of the motor M is connected between the upper bridge arm 102 and the lower bridge arm 103, a control electrode of each power switching tube in the upper bridge arm 102 and the lower bridge arm 103 is connected with the driving signal D, the power switching tubes can be controlled to be turned on or off by the driving signal D, different circuit loops are formed between the upper bridge arm 102 and the lower bridge arm 103, the motor M is connected with different three-phase currents, and the three-phase currents input by the motor M are different, the motor M can realize forward rotation and reverse rotation, so that the power switching tubes in the upper bridge arm 102 and the lower bridge arm 103 can be switched on and off through the driving signal D, and the running state of the motor M is controlled; it should be noted that, a control electrode of the power switching tube in the driving circuit 101 is connected to a driving signal D, where the driving signal is generated by an external control circuit, optionally, a person skilled in the art may use a SVPWM inverter circuit or a SPWM inverter circuit in the conventional technology to implement the above control circuit, and then generate the driving signal D through SVPWM modulation or SPWM modulation, and of course, the person skilled in the art may also use other circuit structures in the conventional technology to implement the above control circuit, which is not described in detail herein.
In the motor drive circuit 10 shown in fig. 1, a sampling resistor R is connected between a dc power supply Vcc and the drive circuit 101, that is, the sampling circuit R is connected in series in a dc bus, and the sampling resistor R has a function of current sampling; through the above discussion, the input current of the motor M can be controlled by the motor driving circuit 10, so as to change the operation state of the motor M, thereby realizing the control of the operation of the motor M.
It should be noted that the motor driving circuit 10 shown in fig. 1 can be used as an object to which the temperature detection and protection method of the present invention is applied, but the motor driving circuit 10 in fig. 1 is only an embodiment and does not constitute a technical limitation for the present application; if a person skilled in the art makes modifications, extensions and extensions on the motor driving circuit 10 shown in fig. 1 to obtain motor driving circuits with different circuit structures, or other types of motor driving circuits in the art include circuit modules such as the motor driving circuit 10 shown in fig. 1, the temperature detection and protection method in the embodiment of the present invention can still be applied to different types of motor driving circuits.
Fig. 2 shows an implementation flow of a temperature detection and protection method for a motor driving circuit according to an embodiment of the present invention, where the temperature detection and protection method in the embodiment of the present invention is used to implement the detection and protection of the internal temperature of a power switch tube in the motor driving circuit to prevent the power switch tube from generating an over-temperature phenomenon; it should be noted that, the motor driving circuit in the embodiment of the present invention includes but is not limited to: the full-bridge driving circuit and the H-bridge driving circuit are not limited to the above, and the temperature detection and protection method of the embodiment of the invention can be applied to different types of motor driving circuits in the field; the circuit structure and the working principle of the motor driving circuit in the embodiment of the present invention can refer to the embodiment of the motor driving circuit 10 in fig. 1, and will not be described herein again; for convenience of explanation, only the parts related to the embodiments of the present invention are shown, and detailed as follows:
as shown in fig. 2, the temperature detection and protection method includes the following steps:
step S201: and sampling the instantaneous running current of each phase through the internal resistance of the power switch tube of each phase of bridge arm to obtain the first phase current.
Optionally, the power switching tube is an MOS (metal oxide semiconductor) tube or an IGBT (Insulated Gate Bipolar Transistor), the power switching tube is a power driving type device, the power switching tube of each phase bridge arm may have a certain internal resistance in the conduction process, in step S201, when the internal resistance of the power switching tube samples the instantaneous operating current of each phase, the current inside each power switching tube may be measured according to the first phase current, and then the temperature inside the power switching tube may be obtained; compared with the prior art that the temperature of the outer surface of the power switch tube can only be detected through the temperature detection device but the internal temperature of the power switch tube cannot be detected, the embodiment of the invention directly samples the current through the internal resistance of the power switch tube, thereby not only saving the industrial cost and reducing the occupied volume of a motor driving circuit, but also more accurately detecting the temperature inside the power switch tube after processing the first phase current and reducing the detection error.
It should be noted that, since the motor is input with a three-phase power, the first phase current includes three phase currents, for example, as shown in fig. 1, the upper arm 102 and the lower arm 103 respectively include three arms; in step S201, in each phase of bridge arm, the instantaneous operating current of each phase of bridge arm is sampled by the internal resistance of each phase of power switching tube, so that the phase current of each phase of bridge arm can be obtained, and the current detection accuracy is greatly improved.
Step S202: sampling the running current of the direct current bus through a sampling resistor to obtain a second phase current; with reference to the circuit structure of the motor driving circuit 10 shown in fig. 1, since the sampling resistor is connected in series in the dc bus, and the magnitude of the operating current in the sampling resistor is the total current output by the dc power supply, the operating current in the dc bus is accurately sampled by the sampling resistor to obtain the second phase current.
Step S203: calculating to obtain a current ratio according to the first phase current and the second phase current; the relative magnitude of the first phase current and the second phase current can be obtained through the current ratio, and the first phase current and the second phase current are favorably standardized.
Step S204: filtering the current ratio to obtain a detection current value; the noise in the signal can be reduced through the filtering processing of the current ratio, and the precision of temperature detection in the power switch tube is further improved.
Step S205: and judging whether the temperature of the power switch tube is in an over-temperature state or not according to the detected current value, and if the power switch tube is in the over-temperature state, sending an over-temperature protection signal.
Specifically, in step S205, since the internal current of the power switch tube can be measured by detecting the current value, it can be accurately determined whether the internal temperature of the power switch tube is in an over-temperature state according to the detected current value, the temperature safety protection level of the power switch tube is higher, and thus the power switch tube is prevented from being damaged greatly due to the over-temperature; if the temperature of the power switch tube is in an over-temperature state, an over-temperature protection signal is sent out immediately, the temperature of the power switch tube can be reduced through the over-temperature protection signal, or temperature alarm information can be sent out through the over-temperature protection signal, so that the power switch tube is prevented from being in an over-temperature operation state for a long time.
In the embodiment of the invention, the temperature detection and protection method directly samples the instantaneous operating current of each phase through the internal resistance of the power switch tube of each phase of bridge arm to obtain the first phase current, other auxiliary temperature detection devices are not needed, the circuit structure is greatly simplified, the circuit manufacturing cost is reduced, the operating current of each phase of bridge arm can be more accurately detected only by sampling the instantaneous operating current through the internal resistance of the power switch tube, and the detection and judgment precision of the internal temperature of the power switch tube in the embodiment of the invention is further improved; meanwhile, a sampling resistor is used for sampling a direct current bus to obtain a second phase current, the temperature detection and protection method in the embodiment of the invention calculates and filters the first phase current and the second phase current to obtain a detected current value, whether the temperature of the power switch tube is in an over-temperature state or not can be accurately judged according to the detected current value, if the power switch tube is in the over-temperature state, the safety protection of the power switch tube is realized through an over-temperature protection signal, and the power switch tube is prevented from being damaged due to high temperature; therefore, the temperature detection and protection method in the embodiment of the invention has simple operation steps, can realize accurate monitoring of the temperature of the power switch tube in the motor driving circuit, prevents the power switch tube from being in a high-temperature operation state, and greatly protects the operation safety of the power switch tube; the problem that the circuit structure is complex and the detection precision of the temperature of the power switch tube is not high due to the fact that the temperature of the power switch tube needs to be detected through an auxiliary temperature detection device in the traditional technology is effectively solved.
As an alternative embodiment, in step 203, the current ratio is calculated as follows:
k＝imos/ibus； (1)
wherein, in the above formula, k is the current ratio, imos is the first phase current, ibus is the second phase current; because the calculation formula (1) is simpler, the current ratio can be quickly calculated through the calculation formula (1).
As an optional implementation manner, fig. 3 shows a specific flow of step S205 provided in the embodiment of the present invention, and as shown in fig. 3, the specific flow specifically includes:
step S301: calculating a normal current threshold value according to preset parameters and the first phase current; the preset parameters include but are not limited to preset temperature, and the normal current threshold value can be obtained after the preset parameters and the first phase current are calculated; optionally, the calculation formula of the normal current threshold may adopt an exponential function, a quadratic function, and the like in the conventional technology, and since the circuit structure and the operation parameters of the motor are too complex, the calculation formula is not limited thereto, and a person skilled in the art can select different calculation formulas in the conventional technology according to the specific structure of the motor to obtain the normal current threshold; the normal current threshold value refers to a safety standard value of the power switch tube at a preset protection temperature.
Step S302: calculating an actual difference value between the detected current value and a normal current threshold value; illustratively, the actual difference is calculated as follows:
C＝kf0-kf； (2)
wherein, in the above formula, C is the actual difference value, kf0 is the detected current value, and kf is the normal current threshold value; from this actual difference it can be derived: at this moment, the difference between the actual motor in the power switch tube and the safety standard value under the preset protection temperature is larger, if the actual difference value is larger, the larger the current in the power switch tube exceeds the safety standard value, the higher the temperature in the power switch tube is, and the more likely the power switch tube is in an over-temperature state.
Step S303: when the actual difference value is larger than the preset difference value, determining that the power switch tube is in an over-temperature state; the preset difference value is a safety threshold value set in advance, and the power switch tube can be in a normal running state only when the difference value between the current in the power switch tube and the normal current threshold value is smaller than or equal to the preset difference value; can be expressed by the following formula:
C>C0(3)
in the above formula (3), C is the actual difference, C0Is a preset difference value; if the condition of the formula (3) is met, the internal temperature of the power switch tube exceeds the normal range, the power switch tube is in an over-temperature state, and at the moment, the power switch tube is subjected to over-temperature protection through an over-temperature protection signal, so that the operation safety of the power switch tube is comprehensively protected.
Since the actual internal current of the power switch tube can be measured by detecting the current value, in the specific process of step S205 shown in fig. 3, whether the power switch tube is in an over-temperature state can be accurately determined according to the difference between the detected current value and the normal threshold value, and thus the internal temperature of the power switch tube can be detected in real time by the temperature detection and protection method in the implementation circuit of the present invention, and the physical damage to the power switch tube caused by the high temperature generated by the over-current is avoided.
Specifically, fig. 4 illustrates another implementation flow of the temperature detection and protection method provided in the embodiment of the present invention, compared with the temperature detection and protection method illustrated in fig. 2; as shown in fig. 4, before step S203, the temperature detecting and protecting method in fig. 4 further includes step S401, specifically:
step S401: converting the first phase current and the second phase current from analog signals to digital signals; in steps S201 and S202, a first phase current and a second phase current are respectively sampled by the internal resistance and the sampling resistance of the power switching tube of each phase bridge arm, and at this time, the first phase current and the second phase current are both continuous analog signals, and since the mobile device is composed of a digital circuit, the analog signals cannot be directly identified and processed by the mobile device; in step S401, after performing signal conversion and encoding on the first phase current and the second phase current, converting the analog signal into a digital signal, so that the first phase current and the second phase current in step S203 are both discrete digital signals, and the digital signals can be directly identified and processed by a digital circuit; therefore, after the first phase current and the second phase current are converted into digital signals, the calculation and filtering operations performed on the first phase current and the second phase current have higher signal processing efficiency, and the temperature detection and protection method in the embodiment of the invention has wider application range and stronger compatibility.
In the embodiment of the invention, after the first phase current and the second phase current are obtained through the internal resistance and the sampling resistance of the power switch tube, the detection current value can be obtained after the first phase current and the first phase current are calculated and filtered, and the detection current value can be used for measuring the actual current in the power switch tube; further, a normal current threshold value of the power switch tube is calculated according to preset parameters and the first phase current, when the difference amplitude of the detected current value and the normal current threshold value exceeds a normal range, the power switch tube can be judged to be in an over-temperature state, and the power switch tube can be prevented from being damaged by over-temperature in real time through an over-temperature protection signal, so that the safe operation of the power switch tube is maintained; therefore, in the temperature detection and protection method provided by the embodiment of the invention, the real-time detection and monitoring of the temperature of the power switch tube can be realized by sampling the internal resistance of the power switch tube in each phase of bridge arm and the resistance of the power switch tube in each phase of bridge arm without an additional auxiliary temperature detection device, the detection precision is high, the power switch tube in the motor driving circuit is prevented from being in an over-temperature state for a long time, and the service life of the power switch tube is prolonged; the problem that the temperature of the power switch tube can only be detected by the aid of an auxiliary temperature detection device and the temperature inside the power switch tube cannot be accurately detected in the prior art is effectively solved.
Fig. 5 illustrates a module structure of a temperature detection and protection system 50 of a motor driving circuit according to an embodiment of the present invention, wherein the motor driving circuit includes a dc power supply, a driving circuit, and a sampling resistor, and the dc power supply can output electric energy; the driving circuit drives the motor to operate according to the driving signal, wherein each phase of upper and lower bridge arms of the driving circuit respectively comprise a power switch tube; the sampling resistor is connected between the direct current power supply and the driving circuit; as shown in fig. 5, the temperature detection and protection system 50 includes: a first current sampling unit 501, a second current sampling unit 502, a current ratio calculation unit 503, a filter processing unit 504 and a temperature determination unit 505.
Specifically, the first current sampling unit 501 samples each phase of instantaneous operating current through the internal resistance of the power switching tube of each phase of bridge arm to obtain a first phase current; the second current sampling unit 502 samples the running current of the direct current bus through a sampling resistor to obtain a second phase current; the current ratio calculation unit 503 obtains a current ratio by calculation according to the first phase current and the second phase current; the filtering processing unit 504 filters the current ratio to obtain a detected current value; the temperature determination unit 505 determines whether the temperature of the power switch tube is in an over-temperature state according to the detected current value, and if the power switch tube is in the over-temperature state, an over-temperature protection signal is sent out, and the over-temperature protection operation can be performed on the power switch tube through the over-temperature protection signal.
It should be noted that, since the temperature detecting and protecting system 50 in fig. 5 corresponds to the temperature detecting and protecting method in fig. 2, a person skilled in the art can compare the specific implementation of the temperature detecting and protecting system 50 in fig. 5 with the embodiment of the temperature detecting and protecting method in fig. 2, and will not be described again.
As an alternative embodiment, in the current ratio calculating unit 503, the calculation formula of the current ratio is as follows:
k＝imos/ibus；
in the above equation, k is the current ratio, imos is the first phase current, and ibus is the second phase current.
As a specific implementation manner, fig. 6 illustrates a specific module structure of the temperature determination unit 505 provided in the embodiment of the present invention, and as shown in fig. 6, the temperature determination unit 505 includes: a parameter setting module 601, a difference value calculating module 602 and an over-temperature identification module 603; specifically, the parameter setting module 601 calculates a normal current threshold according to a preset parameter and the first phase current; the difference calculation module 602 calculates an actual difference between the detected current value and the normal current threshold; when the actual difference is greater than the preset difference, it is determined that the power switching tube is in an over-temperature state, and the over-temperature identification module 603 sends out an over-temperature protection signal.
According to the module structure of the temperature judgment unit 505, the over-temperature identification module 603 can judge whether the power switch tube is in the over-temperature protection state according to the difference amplitude between the detection current value of the power switch tube and the normal current threshold value, the operation process is simple, the temperature judgment unit 505 can accurately identify whether the power switch tube is in the over-temperature state, if the power switch tube is in the over-temperature state, an over-temperature protection signal is immediately sent to the power switch tube to prevent the power switch tube from physical damage caused by high temperature, and therefore the safety precaution level of the power switch tube in the motor driving circuit is greatly improved.
As a preferred implementation manner, fig. 7 illustrates another module structure of the temperature detection and protection system 50 of the motor driving circuit provided in the embodiment of the present invention, compared with the module structure of the temperature detection and protection system 50 illustrated in fig. 5; the temperature detection and protection system 50 in fig. 7 further includes a signal conversion unit 701, specifically, before the current ratio calculation unit 503 calculates the current ratio according to the first phase current and the second phase current, the signal conversion unit 701 converts the first phase current and the second phase current from analog signals into digital signals, and after the first phase current and the second phase current are converted into digital signals, the digital circuit can directly identify and receive the first phase current and the second phase current, so that the temperature detection and protection system 50 in the embodiment of the present invention has a wider application range and a stronger practicability.
In the embodiment of the present invention, the first current sampling unit 501 samples each phase of instantaneous operating current through the internal resistance of the power switching tube to obtain a first phase current, the second current sampling unit 502 samples the operating current of the dc bus through the sampling resistor to obtain a second phase current, further, after the first phase current and the second phase current sequentially pass through the current ratio value calculating unit 503, the filtering processing unit 504, and the temperature judging unit 505, the temperature detecting and protecting system 50 in the embodiment of the present invention can accurately judge whether the internal temperature of the power switching tube exceeds the normal range, if the power switching tube is in the over-temperature state, the temperature judging unit 505 sends out an over-temperature protection signal, and the over-temperature protection signal can provide the over-temperature protection operation for the power switching tube to protect the operation safety of the power switching tube in the motor driving circuit; meanwhile, according to the module structure of the temperature detection and protection system 50, the temperature detection and protection system 50 has a simpler module structure, is easy to implement and has a wider application range; the problem that the traditional technology is difficult to detect the internal temperature of the power switch tube, the power switch tube is easy to be damaged by high temperature during working, and the motor is inconvenient to use is effectively solved.
Fig. 8 shows a module structure of a temperature detection and protection device 80 of a motor driving circuit according to an embodiment of the present invention, wherein the motor driving circuit includes a dc power supply, a driving circuit, and a sampling resistor, and the dc power supply can output electric energy; the driving circuit drives the motor to operate according to the driving signal, wherein each phase of upper and lower bridge arms of the driving circuit respectively comprise a power switch tube; the sampling resistor is connected between the direct current power supply and the driving circuit; as shown in fig. 8, the temperature detection and protection device 80 includes: a first current receiver 801, a second current receiver 802, a memory 803, a processor 805, and a computer program 804 stored in the memory 803 and executable on the processor 805.
Specifically, the first current receiver 801 may receive a first phase current, where the first phase current is obtained by sampling an instantaneous operating current of each phase through an internal resistance of a power switching tube of each phase bridge arm, and further, a current inside the power switching tube may be measured through the first phase current; the second current receiver 802 may receive a second phase current, where the second phase current is obtained by sampling the operating current of the dc bus through a sampling resistor; therefore, the first current receiver 801 and the second current receiver 802 can be used as signal receivers of the temperature detection and protection device 80, and realize a data communication function with an external device.
As an alternative implementation, the first current receiver 801 and the second current receiver 802 may be data converters or data network switches, etc., and the first current receiver 801 and the second current receiver 802 may also be the signal conversion unit 701 shown in fig. 7, and those skilled in the art may also use other data receiving devices in the conventional technology to implement the functions of the current receivers (including the first current receiver 801 and the second current receiver 802) in the embodiments of the present invention; optionally, the first current receiver 801 may receive the first phase current through a wired transmission method such as twisted pair or a wireless transmission method such as bluetooth, and the second current receiver 802 may receive the second phase current through a wired transmission method such as twisted pair or a wireless transmission method such as bluetooth.
The processor 805 invokes the computer program 804 to perform the following steps:
step S801: and calculating a current ratio according to the first phase current and the second phase current.
Step S802: and filtering the current ratio to obtain a detection current value.
Step S803: and judging whether the temperature of the power switch tube is in an over-temperature state or not according to the detected current value, and if the power switch tube is in the over-temperature state, sending an over-temperature protection signal.
It should be noted that, the detailed description of the embodiments of step S801, step S802, and step S803 already exists in the embodiment of the temperature detection and protection method in fig. 2, and those skilled in the art can refer to the embodiment of step S203 to step S205 in the embodiment of fig. 2, and will not be described again here.
As an alternative implementation, the processor 805 executes the computer program 804 to implement the functions of the units in the above formula, for example, the functions of the units 503 to 505 in fig. 5.
Illustratively, the computer program 804 may be divided into one or more modules/units, which are stored in the memory 803 and executed by the processor 805 to carry out the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 804 in the temperature detection and protection device 80. For example, the computer program 804 may be partitioned into a synchronization module, a summarization module, an acquisition module, and a return module.
The temperature detecting and protecting device 80 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The temperature detection and protection device 80 may include, but is not limited to, a processor 805, a memory 803. It will be understood by those skilled in the art that fig. 8 is merely an example of the temperature detection and protection apparatus 80, and does not constitute a limitation of the temperature detection and protection apparatus 80, and may include more or less components than those shown, or combine some components, or different components, for example, the temperature detection and protection apparatus 80 may further include an input-output device, a network access device, a bus, etc.
The Processor 805 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 803 may be an internal storage unit of the temperature detection and protection device 80, such as a hard disk or a memory of the temperature detection and protection device 80. The memory 803 may also be an external storage device of the temperature detecting and protecting apparatus 80, such as a plug-in hard disk, a Smart Memory Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the temperature detecting and protecting apparatus 80. Further, the memory 803 may also include both an internal storage unit and an external storage device of the temperature detection and protection apparatus 80. The memory 803 is used to store the computer program and other programs and data required by the temperature detection and protection device 80. The memory 803 may also be used to temporarily store data that has been output or is to be output.
Therefore, according to the above-mentioned module structure of the temperature detection and protection device 80, the first phase current and the second phase current can be received by the first current receiver 801 and the second current receiver 802, respectively, and then the temperature detection and protection device 80 can process and analyze the first phase current and the second phase current to determine whether the power switch tube in the motor driving circuit is in an over-temperature state, if the power switch tube is in the over-temperature state, the temperature detection and protection device 80 sends out an over-temperature protection signal, thereby realizing the comprehensive safety protection of the power switch tube; meanwhile, in the temperature detection and protection device 80, a data processing algorithm can be added in the computer program 804, so that the data processing and analyzing capabilities of the first-phase current and the second-phase current are improved, the compatibility is stronger, and the temperature detection error is greatly reduced; therefore, the problem that the power switch tube is easily damaged by high temperature due to the fact that the internal temperature of the power switch tube in the motor driving circuit cannot be detected by the traditional temperature detection equipment and the temperature detection precision is low is effectively solved.
Fig. 9 shows a module structure of a motor protection system 90 according to an embodiment of the present invention, and as shown in fig. 9, the motor protection system 90 includes the temperature detection and protection device 80 of the motor driving circuit as described above; since the embodiment of the temperature detection and protection device 80 in fig. 8 has been given above, when the motor protection system 90 includes the temperature detection and protection device 80 in fig. 8, the motor protection system 90 can accurately detect and determine whether the power switch tube in the motor driving circuit is in the over-temperature operation state, and when the power switch tube is in the over-temperature state, the motor driving system 90 performs the over-temperature protection operation on the power switch tube in time through the over-temperature protection signal, so as to prevent the motor driving circuit from stopping working due to the damage of the power switch tube; therefore, in the embodiment of the present invention, the motor protection system 90 performs over-temperature protection on the power switch tube in the motor driving circuit, so as to ensure that the motor can be connected to a stable power supply and can keep normal operation; the defects that the detection precision of a motor protection system in the prior art on the internal temperature of a power switch tube in a motor driving circuit is low, the power switch tube is easily burnt due to high temperature, and then the motor is frequently in abnormal running states such as power-off shutdown and the like are effectively overcome.
It should be noted that, in this document, terms such as plurality and multiplicity refer to a number greater than 1, and relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or structure that comprises a list of elements is inherently related to the elements. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method of temperature detection and protection of a motor drive circuit, the motor drive circuit comprising: a DC power supply for outputting electrical energy; the driving circuit is used for driving the motor to operate according to the driving signal, and each phase of upper and lower bridge arms of the driving circuit respectively comprise a power switch tube; and a sampling resistor connected between the DC power supply and the drive circuit; the temperature detection and protection method is characterized by comprising the following steps:
sampling each phase of instantaneous running current through the internal resistance of the power switch tube of each phase of bridge arm to obtain a first phase current;
sampling the running current of the direct current bus through the sampling resistor to obtain a second phase current;
calculating to obtain a current ratio according to the first phase current and the second phase current;
filtering the current ratio to obtain a detection current value;
judging whether the temperature of the power switch tube is in an over-temperature state or not according to the detected current value, and if the power switch tube is in the over-temperature state, sending an over-temperature protection signal;
wherein, the judging whether the temperature of the power switch tube is in an over-temperature state according to the detection current value specifically comprises:
calculating a normal current threshold value according to preset parameters and the first phase current;
calculating an actual difference value between the detected current value and the normal current threshold value;
and when the actual difference value is larger than a preset difference value, determining that the power switch tube is in an over-temperature state.
2. The temperature detection and protection method according to claim 1, wherein the current ratio is calculated from the first phase current and the second phase current, and specifically:
the calculation formula of the current ratio is as follows:
k＝imos/ibus；
in the above equation, k is the current ratio, imos is the first phase current, and ibus is the second phase current.
3. The temperature detection and protection method of claim 1, wherein prior to calculating the current ratio for the first phase current and the second phase current, the temperature detection and protection method further comprises:
converting the first phase current and the second phase current from analog signals to digital signals.
4. A temperature detection and protection system for a motor drive circuit, the motor drive circuit comprising: a DC power supply for outputting electrical energy; the driving circuit is used for driving the motor to operate according to the driving signal, and each phase of upper and lower bridge arms of the driving circuit respectively comprise a power switch tube; and a sampling resistor connected between the DC power supply and the drive circuit; characterized in that the temperature detection and protection system comprises:
the first current sampling unit is used for sampling each phase of instantaneous running current through the internal resistance of the power switching tube of each phase of bridge arm to obtain a first phase current;
the second current sampling unit is used for sampling the running current of the direct current bus through the sampling resistor to obtain a second phase current;
the current ratio calculation unit is used for calculating a current ratio according to the first phase current and the second phase current;
the filtering processing unit is used for filtering the current ratio to obtain a detection current value;
the temperature judging unit is used for judging whether the temperature of the power switch tube is in an over-temperature state or not according to the detected current value, and if the power switch tube is in the over-temperature state, an over-temperature protection signal is sent out;
wherein the temperature judging unit includes:
the parameter setting module is used for calculating a normal current threshold value according to preset parameters and the first phase current;
the difference value calculation module is used for calculating the actual difference value of the detection current value and the normal current threshold value;
and the over-temperature identification module is used for determining that the power switch tube is in an over-temperature state and sending out the over-temperature protection signal when the actual difference value is larger than a preset difference value.
5. The temperature detection and protection system according to claim 4, wherein in the current ratio calculation unit, the current ratio is calculated by the following formula:
k＝imos/ibus；
in the above equation, k is the current ratio, imos is the first phase current, and ibus is the second phase current.
6. The temperature detection and protection system of claim 4, further comprising:
and the signal conversion unit is used for converting the first phase current and the second phase current from analog signals into digital signals.
7. A temperature detection and protection device for a motor drive circuit, the motor drive circuit comprising: a DC power supply for outputting electrical energy; the driving circuit is used for driving the motor to operate according to the driving signal, and each phase of upper and lower bridge arms of the driving circuit respectively comprise a power switch tube; and a sampling resistor connected between the DC power supply and the drive circuit; characterized in that the temperature detection and protection device comprises: a first current receiver, a second current receiver, a memory, a processor, and a computer program stored in the memory and executable on the processor;
the first current receiver is used for receiving a first phase current, wherein the first phase current is obtained by sampling each phase of instantaneous operating current through the internal resistance of the power switch tube of each phase of bridge arm;
the second current receiver is used for receiving a second phase current, wherein the second phase current is obtained by sampling the running current of the direct current bus through the sampling resistor;
the processor calls the computer program for performing the steps of:
calculating to obtain a current ratio according to the first phase current and the second phase current;
filtering the current ratio to obtain a detection current value;
judging whether the temperature of the power switch tube is in an over-temperature state or not according to the detected current value, and if the power switch tube is in the over-temperature state, sending an over-temperature protection signal;
wherein, the judging whether the temperature of the power switch tube is in an over-temperature state according to the detection current value specifically comprises:
calculating a normal current threshold value according to preset parameters and the first phase current;
calculating an actual difference value between the detected current value and the normal current threshold value;
and when the actual difference value is larger than a preset difference value, determining that the power switch tube is in an over-temperature state.
8. A motor protection system comprising the temperature detection and protection device of the motor drive circuit according to claim 7.
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| CN117767750A (en) * | 2023-11-23 | 2024-03-26 | 宁波扬笛声学科技有限公司 | PWM switching power supply circuit and MOS tube internal resistance detection method thereof |
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| US6647325B2 (en) * | 2001-02-19 | 2003-11-11 | Kokusan Denki Co., Ltd. | Control system for electric motor for driving electric vehicle |
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| CN102490614A (en) * | 2011-11-15 | 2012-06-13 | 上海三运电机控制技术有限公司 | Comprehensive protection control method for controller drive system of electric automobile |
| CN105515472A (en) * | 2016-01-25 | 2016-04-20 | 无锡凌鸥微电子有限公司 | Motor drive current detection circuit and control system |
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