CN113346734A - IGBT control circuit, control method, device, equipment and air conditioner - Google Patents
IGBT control circuit, control method, device, equipment and air conditioner Download PDFInfo
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- CN113346734A CN113346734A CN202110741398.4A CN202110741398A CN113346734A CN 113346734 A CN113346734 A CN 113346734A CN 202110741398 A CN202110741398 A CN 202110741398A CN 113346734 A CN113346734 A CN 113346734A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
本申请公开了一种IGBT控制电路、控制方法、装置、设备及空调器，IGBT控制电路包括：驱动模块，驱动模块包括若干个驱动通道，每一个驱动通道包括驱动单元和栅极电阻，驱动单元与栅极电阻的一端连接，栅极电阻的另一端用于连接至IGBT；参数检测模块，用于检测空调运行参数，空调运行参数包括空调运行电压参数和空调运行电流参数中的至少一种；控制模块，用于根据空调运行参数，选择驱动通道。本申请通过空调运行参数选择合适的驱动通道来驱动IGBT动作，驱动通道的栅极电阻的不同，可以对应改变IGBT的开关速度，使得IGBT的开关速度灵活可调整，适应不同的负载情况。本申请可广泛应用于功率半导体器件技术领域。
The present application discloses an IGBT control circuit, a control method, a device, a device and an air conditioner. The IGBT control circuit includes a drive module, the drive module includes a plurality of drive channels, each drive channel includes a drive unit and a gate resistor, and the drive unit is connected to one end of the grid resistor, and the other end of the grid resistor is used to connect to the IGBT; the parameter detection module is used to detect the air conditioner operation parameter, and the air conditioner operation parameter includes at least one of the air conditioner operation voltage parameter and the air conditioner operation current parameter; The control module is used to select the drive channel according to the operating parameters of the air conditioner. In the present application, an appropriate drive channel is selected to drive the IGBT through the operating parameters of the air conditioner. The gate resistance of the drive channel is different, and the switching speed of the IGBT can be changed correspondingly, so that the switching speed of the IGBT can be flexibly adjusted to adapt to different load conditions. The present application can be widely used in the technical field of power semiconductor devices.
Description
Technical Field
The invention relates to the technical field of power semiconductor devices, in particular to an IGBT control circuit, an IGBT control method, an IGBT control device, IGBT equipment and an air conditioner.
Background
At present, in a totem pole Power Factor Correction (PFC) circuit of a variable frequency air conditioner, an IGBT is arranged at an output end of a rectifier module to adjust a phase and proportion relationship between current and voltage output by the rectifier module, so that the current and the voltage output by the rectifier module keep the same phase and proportion as much as possible.
In the related art, the switching speed of the IGBT in the PFC circuit is fixed and cannot be flexibly adjusted according to the load condition, and under a light load condition, the switching speed of the IGBT is small and the amount of heat generated by the operation of the IGBT is small, but under a heavy load condition, the IGBT needs to be maintained at a large switching speed, and if the IGBT is still maintained at a small switching speed, the IGBT has the problems of large switching loss and high heat generation, which seriously affects the service life of the IGBT.
Disclosure of Invention
The embodiment of the application provides an IGBT control circuit, a control method, a control device, equipment and an air conditioner, and a proper driving channel can be selected according to air conditioner operation parameters, so that the switching loss and the heat productivity of the IGBT are reduced.
In one aspect, an embodiment of the present application provides an IGBT control circuit, which is applied to a totem-pole power factor correction circuit, where the totem-pole power factor correction circuit includes an IGBT, and the IGBT control circuit includes:
the driving module comprises a plurality of driving channels, each driving channel comprises a driving unit and a grid resistor, the driving unit is connected with one end of the grid resistor, and the other end of the grid resistor is used for being connected to the IGBT;
the parameter detection module is used for detecting air conditioner operation parameters, and the air conditioner operation parameters comprise at least one of air conditioner operation voltage parameters and air conditioner operation current parameters;
the input end of the control module is connected with the output end of the parameter detection module, and the output end of the control module is connected with the input end of the driving module;
the control module is used for selecting the driving channel according to the air conditioner operation parameters.
The IGBT control circuit according to the embodiment of the invention at least has the following beneficial effects:
in the embodiment of the application, the IGBT is driven to act by selecting the appropriate driving channel according to the operation parameters of the air conditioner, the switching speed of the IGBT can be correspondingly changed according to the difference of the grid resistances of the driving channels, so that the switching speed of the IGBT is flexible and adjustable, the IGBT can adapt to different load conditions, the purposes of reducing switching loss and heating amount are achieved, and the service life of the IGBT is prolonged.
According to some embodiments of the invention, the totem-pole power factor correction circuit comprises a loop resistor, and the parameter detection module comprises a first voltage detection unit;
the input end of the first voltage detection unit is connected with the loop resistor, and the output end of the first voltage detection unit is connected with the control module;
the first voltage detection unit is used for obtaining the voltage of the loop resistor, and the control module is further used for determining the air conditioner operation current parameter according to the voltage of the loop resistor and the resistance value of the loop resistor.
The embodiment of the application provides a realization mode for measuring air conditioner running current parameters, and the air conditioner running current parameters can be obtained according to the voltages at the two ends of the loop resistor and the resistance value of the loop resistor by obtaining the voltages at the two ends of the loop resistor, so that the realization mode has the characteristic of simple realization principle.
According to some embodiments of the invention, the totem-pole power factor correction circuit comprises a rectification module, and the parameter detection module comprises a second voltage detection unit;
the input end of the second voltage detection unit is connected with the positive electrode output end of the rectification module, and the output end of the second voltage detection unit is connected with the input end of the control module;
the second voltage detection unit is used for detecting the air conditioner operation voltage parameter.
The embodiment of the application provides an implementation mode for measuring an air conditioner operating voltage parameter, wherein a second detection unit is used for detecting the voltage output by a rectification module, and the voltage is used as the air conditioner operating voltage parameter and is used for reflecting the load condition.
According to some embodiments of the invention, the parameter detection module comprises a temperature detection unit;
the temperature detection unit is connected with the control module;
the temperature detection unit is used for detecting the real-time working temperature of the IGBT, and the control module is further used for selecting the driving channel according to the real-time working temperature of the IGBT.
In the embodiment of the application, an implementation mode for reflecting the index of the load weight based on the environmental parameters is provided, and the purpose of flexibly controlling the switching speed of the IGBT is achieved by acquiring the real-time working temperature of the IGBT and selecting the corresponding driving channel according to the real-time working temperature.
According to some embodiments of the invention, the driving module comprises a number of driving chips.
On the other hand, an embodiment of the present application provides a control method for an IGBT control circuit, where the IGBT control circuit is configured to control an IGBT of a totem-pole power factor correction circuit, the IGBT control circuit includes a driving module, the driving module includes a plurality of driving channels, each driving channel includes a driving unit and a gate resistor, the driving unit is connected to one end of the gate resistor, and the other end of the gate resistor is configured to be connected to the IGBT, and the control method includes the following steps:
acquiring air conditioner operation parameters, wherein the air conditioner operation parameters comprise at least one of air conditioner operation power parameters, air conditioner operation voltage parameters and air conditioner operation current parameters, and the air conditioner operation power parameters can be obtained by calculation according to the air conditioner operation voltage parameters and the air conditioner operation current parameters;
and selecting a driving channel according to the air conditioner operation parameters, wherein the driving channel is a driving channel contained in a driving module of the IGBT control circuit and comprises a driving unit and a grid resistor, the driving unit is connected with one end of the grid resistor, and the other end of the grid resistor is used for being connected to the IGBT.
The control method provided by the embodiment of the invention at least has the following beneficial effects:
the IGBT is driven to act by selecting a proper driving channel according to the operation parameters of the air conditioner, the switching speed of the IGBT can be correspondingly changed according to the difference of the grid resistances of the driving channels, so that the switching speed of the IGBT can be flexibly adjusted, the IGBT is suitable for different load conditions, the purposes of reducing the switching loss and the heat productivity are achieved, and the service life of the IGBT is prolonged.
According to some embodiments of the invention, the control method further comprises the steps of:
acquiring the real-time working temperature of the IGBT;
and selecting the driving channel according to the real-time working temperature of the IGBT.
The method and the device can not only utilize the electrical parameters of the air conditioner as the indexes for measuring the load weight, but also utilize the environmental parameters as the indexes for measuring the load weight. In the embodiment, because the IGBT generates a relatively high amount of heat when operating under a heavy load, the real-time operating temperature of the IGBT can also be used as an index for measuring the load weight, and the switching speed of the IGBT can be flexibly controlled by obtaining the real-time operating temperature of the IGBT and selecting a corresponding driving channel according to the real-time operating temperature.
On the other hand, an embodiment of the present application provides an IGBT control device, including:
at least one processor;
at least one memory for storing at least one program;
when the at least one program is executed by the at least one processor, the at least one processor is caused to implement a control method as described above.
In another aspect, an embodiment of the present application provides an apparatus, including:
IGBT；
the IGBT is driven by an IGBT control circuit as described above or an IGBT control device as described above.
In another aspect, the present application provides an apparatus including the aforementioned device and a totem-pole power factor correction circuit.
In another aspect, an embodiment of the present application provides an air conditioner, which is characterized by including the aforementioned IGBT control device or one of the aforementioned devices.
On the other hand, an embodiment of the present application provides a storage medium, which is characterized by storing a program, and the program is used for realizing the control method as described above when being executed by a processor.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description is made on the drawings of the embodiments of the present application or the related technical solutions in the prior art, and it should be understood that the drawings in the following description are only for convenience and clarity of describing some embodiments in the technical solutions of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
The invention is further described with reference to the following figures and examples, in which:
fig. 1 is a schematic circuit diagram of a PFC circuit in the related art;
fig. 2 is a schematic circuit diagram of a parameter detection module and a PFC circuit according to an embodiment of the present disclosure;
fig. 3 is a block diagram of an IGBT control circuit according to an embodiment of the present application;
FIG. 4 is a flowchart illustrating steps of a control method according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an IGBT control device according to an embodiment of the present application;
FIG. 6 is a schematic view of an apparatus according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of an apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, in the related art, in order to obtain a high power factor, a PFC circuit is commonly used to provide a bus voltage (i.e., a voltage output across a capacitor E1 is the bus voltage) for an air conditioner. The PFC circuit is provided with an IGBT Q1 at the output end of a rectifying module thereof, and is used for adjusting the phase and the proportional relation of the current and the voltage of the PFC circuit.
In the PFC circuit, the switching speed of the IGBT Q1 is usually fixed and cannot be adaptively adjusted according to the load condition of the air conditioner, and particularly, in the heavy load condition, because the switching speed of the IGBT Q1 is relatively low, the switching loss increases, the IGBT Q1 generates heat seriously, and the service life of the IGBT Q1 is affected.
It should be noted that the heavy load condition refers to a condition that the overall operation power of the air conditioner is large, and the light load condition refers to a condition that the overall operation power of the air conditioner is small, and the heavy load condition and the light load condition are the same as those in the present description, and will not be explained too much.
It should be noted that the above is only for assisting understanding of the technical solutions in the present application, and does not represent the prior art considered to be disclosed.
To this end, with reference to fig. 3, the present application provides an IGBT control circuit applied to a totem-pole power factor correction circuit, the totem-pole power factor correction circuit including an IGBT Q1, the IGBT control circuit including:
the driving module comprises a plurality of driving channels, each driving channel comprises a driving unit and a grid resistor, the driving units are connected with one end of the grid resistor, and the other end of the grid resistor is used for being connected to the IGBT Q1;
the parameter detection module is used for detecting air conditioner operation parameters, and the air conditioner operation parameters comprise at least one of air conditioner operation voltage parameters and air conditioner operation current parameters;
the input end of the control module is connected with the output end of the parameter detection module, and the output end of the control module is connected with the input end of the driving module;
the control module is used for selecting a driving channel according to the air conditioner operation parameters.
Specifically, the switching speed of IGBT Q1 is related to the value of the gate resistor connected to its gate (i.e., G pole), which determines the switching speed of IGBT Q1, as: the larger the resistance value of the gate resistor is, the smaller the switching speed of the IGBT Q1 is; conversely, the smaller the resistance of the gate resistor, the greater the switching speed of IGBT Q1.
Based on the principle of the switching speed of the IGBT, referring to fig. 3, the driving module of the present application includes a plurality of driving channels, each driving channel includes a driving unit and a gate resistor, the driving unit is configured to drive the IGBT according to the control signal of the control module, and since the gate resistors of the driving channels have different resistance values, the control module achieves the purpose of controlling the switching speed of the IGBT by selecting different driving channels, that is, different gate resistors.
The parameter detection module can comprise a plurality of detection units and is used for detecting air conditioner operation parameters including an air conditioner operation voltage parameter and an air conditioner operation current parameter and calculating an air conditioner operation power parameter by utilizing the air conditioner operation voltage parameter and the air conditioner operation current parameter, wherein the air conditioner operation voltage parameter refers to input voltage when the air conditioner operates, the air conditioner operation current parameter refers to the whole machine current when the air conditioner operates, and the air conditioner operation power parameter refers to the whole machine power when the air conditioner operates.
By using the electrical parameters as indexes, the control module compares the air conditioner operation parameters with preset air conditioner operation parameters (including preset voltage parameters, preset current parameters and preset power parameters), judges the light and heavy conditions of the load of the IGBT Q1 and selects a corresponding driving channel. The control module has data processing and controlling functions, and can adopt a singlechip, a processor and the like in the prior art. The control module outputs a control signal to the driving unit of the driving channel, so that the driving unit is used for driving the IGBT Q1 to act, and the resistance value of the gate resistor contained in each driving channel is different, so that the purpose of adaptively adjusting the switching speed of the IGBT Q1 can be achieved.
Through the mode, when the control module judges that the load is light, the resistance value of the gate resistor of the selected driving channel is large, the switching speed of the IGBT Q1 is low, at the moment, the current of the whole air conditioner is low when the air conditioner runs, the switching loss of the IGBT Q1 is low, the generated heat is low, in addition, the switching speed of the IGBT is low, and the influence of electromagnetic interference is low; when the control module judges that the load is heavy, the resistance value of the gate resistor of the selected driving channel is small, the switching speed of the IGBT Q1 is high, the switching loss is small, and the heating value is small.
In order to more clearly illustrate the operating principle of the IGBT control circuit of the present application, an implementation of the present application will be described in detail, taking an air conditioner operation power parameter as an example.
The parameter detection module is used for acquiring an air conditioner running voltage parameter and an air conditioner running current parameter of the air conditioner, and the control module calculates an air conditioner running power parameter according to the air conditioner running voltage parameter and the air conditioner running current parameter and according to the actual running condition of the air conditioner. For example, the value range of the preset power parameter may be set to [ m1, m2 ]]When the control module determines that the value of the air conditioner operation power parameter is smaller than m1, the control module determines that the IGBT Q1 is in a light load condition, the control module selects a first driving channel as a driving channel of the IGBT, and the first driving channel corresponds to a first gate resistor RG1(ii) a When the control module judges that the value of the air conditioner operation power parameter is [ m1, m2 ]]Within the range, the IGBT Q1 is determined to be in the medium-load condition, the control module selects the second driving channel as the driving channel of the IGBT, and the second driving channel corresponds to the second gate resistor RG2(ii) a When the control module determines that the value of the air conditioner operation power parameter is larger than m2, the IGBT Q1 is determined to be in a heavy load condition, the control module selects a third driving channel as a driving channel of the IGBT, and the third driving channel corresponds to a third gate resistor RG3. In this embodiment, the first gate resistance RG1The resistance value is larger than the second grid resistance RG2And a third gate resistance RG3A second gate resistance RG2Is greater than the third gate resistance RG3The switching speed of the IGBT in each load case can be controlled for the three load cases.
It can be understood that, in the embodiment, the preset power parameter may also be set to a plurality of continuous value ranges, and the load condition where the IGBT is located is subdivided, so as to accurately adjust the switching speed of the IGBT. Of course, the embodiment may also set the preset power parameter as a fixed value, determine the relationship between the air conditioner operation power parameter and the fixed value, and divide the load condition of the IGBT into only a light load condition and a heavy load condition.
The above is an embodiment of determining the load condition by using the air conditioner operating power parameter, and the implementation of determining the load condition by using the air conditioner operating voltage parameter and the air conditioner operating current parameter is similar to the above, and is not described herein again.
It can be seen from the above content that, according to the application, the proper driving channel is selected through the air conditioner operation parameters to drive the IGBT Q1 to act, and the switching speed of the IGBT Q1 can be correspondingly changed due to the difference of the gate resistances of the driving channels, so that the switching speed of the IGBT Q1 is flexibly adjustable to adapt to different load conditions, the purpose of reducing the switching loss and the heat productivity of the IGBT Q1 is achieved, and the service life of the IGBT Q1 is prolonged.
As an alternative embodiment, referring to fig. 2, the totem-pole power factor correction circuit includes a loop resistor R1, and the parameter detection module includes a first voltage detection unit;
the input end of the first voltage detection unit is connected with the loop resistor R1, and the output end of the first voltage detection unit is connected with the control module;
the first voltage detection unit is used for obtaining the voltage of the loop resistor R1, and the control module is further used for determining the air conditioner operation current parameter according to the voltage of the loop resistor R1 and the resistance value of the loop resistor R1.
In this embodiment, referring to fig. 2, the loop resistor R1 is in a loop of the PFC circuit, the first voltage detection unit is used to detect voltages at two ends of the loop resistor R1, the control module acquires the voltages at two ends of the loop resistor R1 through the control module detection port, and calculates a loop current of the PFC circuit according to the voltages at two ends of the loop resistor R1 and the resistance of the loop resistor R1. The loop current can reflect the light and heavy conditions of the load and is used as one of indexes for weighing the light and heavy conditions of the load, so that the loop current can be used as an air conditioner operation current parameter for indicating the light and heavy conditions of the load. It is understood that the first voltage detection unit may be implemented by a circuit or a unit having a voltage detection capability, which is not specifically limited in this application. For example, as shown in fig. 2, the first voltage detecting unit may perform voltage measurement using a circuit composed of an operational amplifier U1, resistors R5, R6, R7, and R8, and a capacitor C2.
While the above describes an embodiment of indirectly measuring the loop current, the loop current may be obtained by directly measuring the loop current, for example, by using a current sensor, a current transformer, etc.
As an alternative embodiment, referring to fig. 2, the totem-pole power factor correction circuit includes a rectification module, and the parameter detection module includes a second voltage detection unit;
the input end of the second voltage detection unit is connected with the positive electrode output end of the rectification module, and the output end of the second voltage detection unit is connected with the input end of the control module;
the second voltage detection unit is used for detecting the air conditioner operation voltage parameter.
Specifically, the rectifier module is configured to convert an input ac power into a dc power, the second voltage detection unit is configured to detect a magnitude of an output voltage of the rectifier module, and the magnitude of the output voltage at the output end of the rectifier module may also reflect a magnitude of a load, which is one of indexes for measuring the magnitude of the load.
In a specific embodiment, referring to fig. 2, the second voltage detecting unit includes a serial voltage dividing circuit composed of a second resistor R2 and a third resistor R3, and the control module collects a node voltage between the second resistor R2 and the third resistor R3 through a control module detecting port as an air conditioner operating voltage parameter.
As an alternative embodiment, the parameter detection module includes a temperature detection unit;
the temperature detection unit is connected with the control module;
the temperature detection unit is used for detecting the real-time working temperature of the IGBT Q1, and the control module is further used for selecting a driving channel according to the real-time working temperature of the IGBT Q1.
Specifically, the electrical parameters (including air conditioner operating voltage parameters, air conditioner operating current parameters, air conditioner operating power parameters and the like) of the air conditioner can be used as the index for measuring the load weight, and the environmental parameters can also be used as the index for measuring the load weight. In the present embodiment, since the IGBT Q1 generates a high amount of heat when operating under a heavy load, the real-time operating temperature of the IGBT Q1 can also be used as an index for weighing the load. In a specific embodiment, the temperature detection unit may comprise an NTC thermistor for acquiring the real-time operating temperature of the IGBT Q1. And the control module selects a proper driving channel to drive the IGBT Q1 according to the acquired real-time working temperature and the preset working temperature.
Illustratively, the control module compares the real-time operating temperature with a preset operating temperature according to the real-time operating temperature of the IGBT Q1 collected by the thermistor, for example, the preset operating temperature is set to n1, when the real-time operating temperature of the IGBT Q1 is greater than n1, which indicates that the IGBT Q1 generates heat seriously and the load is heavy, the control module selects a fourth driving channel corresponding to the fourth gate resistor RG4(ii) a When the real-time working temperature of the IGBT Q1 is lower than n1, which indicates that the heat generated by the IGBT Q1 is small and the load is light, the control module selects a fifth driving channel, and the fifth driving channel corresponds to a fifth gate resistor RG5In addition, the fourth gate resistance RG4Is less than the fifth gate resistance RG5So that the switching speed of the IGBT under heavy load is greater than that under light load.
It should be noted that, in the above embodiment, the load condition of the IGBT is only divided into the light and heavy conditions by using the preset operating temperature, and the value range of the preset operating temperature may also be set as a continuous interval, so as to subdivide the light and heavy conditions of the load of the IGBT and achieve the purpose of accurately adjusting the switching speed of the IGBT, which is not described herein again.
As an alternative embodiment, the driving module includes several driving chips.
Specifically, the driving module is used for driving the IGBT Q1 to act according to the control signal provided by the control module. In a specific embodiment, the driving module includes a plurality of driving chips, and the specific number of the driving chips can be selected according to actual needs. For example, the driving chip may select a dual-channel gate driver with the model of IR4427, and one IRR4427 dual-channel gate driver may be matched with two gate resistors to form two driving channels, so that the number of the IRR4427 dual-channel gate drivers used in the driving module may be determined according to actual requirements.
Based on the foregoing description of the IGBT control circuit, the specific working process of the IGBT control circuit of the present application is as follows:
the first voltage detection unit detects voltages at two ends of a loop resistor of the PFC circuit, and the control module calculates loop current of the PFC circuit according to the voltages at the two ends of the loop resistor and the resistance value of the loop resistor and takes the loop current as an air conditioner operating current parameter;
the second voltage detection unit detects the voltage at the output end of a rectification module of the PFC circuit, and the voltage at the output end of the rectification module is used as an air conditioner operation voltage parameter;
in addition, the control module obtains an air conditioner operation voltage parameter and an air conditioner operation current parameter, and calculates an air conditioner operation power parameter according to the air conditioner operation voltage parameter and the air conditioner operation current parameter, wherein the air conditioner operation voltage parameter, the air conditioner operation current parameter and the air conditioner operation power parameter are all electrical parameters and serve as indexes for indicating load weight.
In addition, the parameter detection module of the IGBT control circuit can also acquire environmental parameters as an index for measuring the load weight, wherein the temperature detection unit can acquire the real-time working temperature of the IGBT Q1.
The control module judges the light and heavy conditions of the load of the IGBT Q1 according to the electric indexes and the environmental indexes, for example, the control module compares the air conditioner running power parameters with preset power parameters, the value of the preset power parameters can be set to 4000 watts according to the actual conditions, when the load running power is judged to be more than or equal to 4000 watts, the IGBT Q1 can be considered to be in the heavy load condition, the control module selects a driving channel with smaller grid resistance to drive the IGBT Q1 according to the judgment result, and at the moment, the switching speed of the IGBT Q1 is higher, the switching loss is small, and the heating value is small; when the load operation power is judged to be less than or equal to 4000 watts, the IGBT is judged to be in a light load condition, the control module selects a drive channel with larger grid resistance to drive the IGBT Q1 according to the judgment result, the current of the whole air conditioner during operation is smaller, the switching loss of the IGBT Q1 is smaller, and the generated heat is lower. Certainly, the value of the preset power parameter can also be set to be a value interval or a continuous value interval, so that the light and heavy conditions of the load are accurately divided, and the switching speed of the IGBT is accurately adjusted.
And the switching speed of the IGBT can be adjusted by utilizing the air conditioner running voltage parameter, the air conditioner running current parameter and the real-time working temperature of the IGBT by the same principle.
To sum up, this application can confirm the light heavy condition of actual load according to electric index and trade the index as the detection condition to according to the light heavy condition of load, confirm the drive channel of IGBT, thereby make current IGBT's switching speed and current load condition phase-match, reach the purpose that reduces switching loss and calorific capacity, prolong IGBT's life.
Referring to fig. 4, the present invention further provides a control method for an IGBT control circuit, where the IGBT control circuit is used to control an IGBT of a totem-pole power factor correction circuit, the IGBT control circuit includes a driving module, the driving module includes a plurality of driving channels, each driving channel includes a driving unit and a gate resistor, the driving unit is connected to one end of the gate resistor, and the other end of the gate resistor is used to be connected to the IGBT, and the control method includes the following steps:
s1, obtaining air conditioner operation parameters, wherein the air conditioner operation parameters comprise at least one of air conditioner operation power parameters, air conditioner operation voltage parameters and air conditioner operation current parameters, and the air conditioner operation power parameters are obtained through calculation according to the air conditioner operation voltage parameters and the air conditioner operation current parameters;
and S2, selecting a driving channel of the driving module according to the air conditioner operation parameters.
The switching speed of the IGBT in the PFC circuit is usually fixed and constant, and the IGBT cannot adjust its switching speed in time according to the load condition, which results in the IGBT being under a heavy load condition.
The IGBT control circuit comprises a parameter detection module, a control module and a driving module.
The control module has data processing and controlling functions, and can adopt a singlechip, a processor and the like in the prior art.
The parameter detection module can comprise a plurality of detection units and is used for detecting air conditioner operation parameters including an air conditioner operation voltage parameter and an air conditioner operation current parameter, and the control module can also calculate an air conditioner operation power parameter by utilizing the air conditioner operation voltage parameter and the air conditioner operation current parameter, wherein the air conditioner operation voltage parameter refers to input voltage when the air conditioner operates, the air conditioner operation current parameter refers to the whole machine current when the air conditioner operates, and the air conditioner operation power parameter refers to the whole machine power when the air conditioner operates.
The driving unit of the driving module is used for driving the IGBT according to the input control signal, and because the resistance values of the gate resistors of the driving channels are different, the switching speed of the IGBT can be controlled by selecting different driving channels, namely different gate resistors.
By using the electrical parameters as indexes, the control module compares the air conditioner operation parameters with preset air conditioner operation parameters (including preset voltage parameters, preset current parameters and preset power parameters), judges the light and heavy conditions of the load of the IGBT Q1 and selects a corresponding driving channel. The control module outputs control signals to the driving units of the driving channels, so that the driving units are used for driving the IGBTs to act, and the aim of adaptively adjusting the switching speed of the IGBTs can be fulfilled due to the fact that the resistance values of the gate resistors contained in each driving channel are different.
When the control module judges that the load is light, the resistance value of the grid resistor of the selected driving channel is large, the switching speed of the IGBT is small, at the moment, the current of the whole air conditioner is small when the air conditioner runs, the switching loss of the IGBT is small, the generated heat is low, in addition, the switching speed of the IGBT is small, and the influence of electromagnetic interference is small; when the control module judges that the load is heavy, the resistance value of the gate resistor of the selected driving channel is small, the switching speed of the IGBT is high, the switching loss is low, and the heat productivity is low.
In summary, in the embodiment of the method, at least one air conditioner operation parameter including an air conditioner operation power parameter, an air conditioner operation voltage parameter and an air conditioner operation current parameter is obtained, a suitable driving channel is selected according to the air conditioner operation parameter to drive the IGBT to operate, and the switching speed of the IGBT can be correspondingly changed according to the difference of the gate resistance of the driving channel, so that the switching speed of the IGBT can be flexibly adjusted, the IGBT can adapt to different load conditions, the purpose of reducing switching loss and heating value is achieved, and the service life of the IGBT is prolonged.
As an alternative embodiment, the control method further comprises the steps of:
s3, acquiring the real-time working temperature of the IGBT;
and S4, selecting a driving channel according to the real-time working temperature of the IGBT.
Specifically, when the IGBT works under a heavy load, the heat generated by the IGBT is high, and the temperature of the IGBT is high, so that the real-time working temperature of the IGBT can also be used as an index for measuring the load weight, and therefore, according to the real-time working temperature of the IGBT, a corresponding driving channel can be selected to drive the IGBT, and the purpose of adaptively adjusting the switching speed of the IGBT can also be achieved.
Illustratively, the real-time operating temperature of the IGBT is acquired, and the real-time operating temperature is compared with a preset operating temperature, for example, the preset operating temperature is set to n1, and when the real-time operating temperature of the IGBT Q1 is greater than n1, which indicates that the IGBT generates heat seriously and the load is heavy, a sixth driving channel is selected to drive the IGBT, and the sixth driving channel corresponds to a sixth gate resistor RG6(ii) a When the real-time working temperature of the IGBT is lower than n1, which indicates that the heat generated by the IGBT is small and the load is light, the first driving channel is selected to drive the IGBT, and the seventh driving channel corresponds to the seventh gate resistor RG7In addition, the sixth gate resistance RG6Is less than the seventh gate resistance RG7So that the switching speed of the IGBT under heavy load is higher than that of the IGBT under light loadSwitching speed under load.
Referring to fig. 5, an embodiment of the present application further provides an IGBT control device, including:
at least one processor 201;
at least one memory 202 for storing at least one program;
when the at least one program is executed by the at least one processor 201, the at least one processor 201 is enabled to implement one of the control method embodiments described above.
The processor 201 and memory 202 may be connected by a bus or other means.
The memory 202, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer-executable programs. Further, the memory 202 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 202 may optionally include memory located remotely from the processor 201, which may be connected to the device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The contents in the above method embodiments are all applicable to the present IGBT control device embodiment, the functions specifically implemented by the present device embodiment are the same as those in the above method embodiments, and the advantageous effects achieved by the present device embodiment are also the same as those achieved by the above method embodiments.
Referring to fig. 6, an embodiment of the present application further provides an apparatus, including:
IGBT；
the IGBT is driven by an IGBT control circuit of the above-described embodiment or an IGBT control device as shown in fig. 5.
Referring to fig. 7, an apparatus including the device shown in fig. 6 and a totem-pole power factor correction circuit is also provided in the embodiments of the present application.
The embodiment of the application also provides an air conditioner which comprises the IGBT control device shown in figure 5 or the equipment shown in figure 7.
The embodiment of the application also provides a storage medium, wherein the storage medium stores a program, and the program is used for realizing the embodiment of the control method when being executed by a processor.
Similarly, the content in the embodiments of the IGBT control circuit and the IGBT control device described above is applicable to the embodiments of the present device, apparatus, air conditioner and storage medium, and the functions implemented in the embodiments of the present device, apparatus, air conditioner and storage medium are the same as those in the embodiments of the IGBT control circuit and the IGBT control device described above, and the beneficial effects achieved by the embodiments of the totem pole power factor correction circuit and the device described above are also the same as those achieved by the embodiments of the totem pole power factor correction circuit and the device described above.
It will be understood that all or some of the steps, systems of methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (12)
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